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Finding the Fourth Proportional to 11,891.55, 16,421.37 and 8,902.19

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Solution

The fourth proportional to 11,891.55, 16,421.37 and 8,902.19 is: 12,293.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,891.55 : 16,421.37 = 8,902.19 : x
  2. Step 2: Convert to fraction form
    11,891.55/16,421.37 = 8,902.19/x
  3. Step 3: Cross multiply
    11,891.55x = 16,421.37 × 8,902.19
  4. Step 4: Simplify right side
    11,891.55x = 146,186,111.29
  5. Step 5: Solve for x
    x = 146,186,111.29/11,891.55
  6. Step 6: Final answer
    x = 12,293.28

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Half scale
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Double scale
Find fourth proportional to 11,892.55, 16,422.75 and 8,903.19
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.