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Finding the Fourth Proportional to 11,891.54, 16,409.88 and 6,513.90

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Solution

The fourth proportional to 11,891.54, 16,409.88 and 6,513.90 is: 8,988.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,891.54 : 16,409.88 = 6,513.90 : x
  2. Step 2: Convert to fraction form
    11,891.54/16,409.88 = 6,513.90/x
  3. Step 3: Cross multiply
    11,891.54x = 16,409.88 × 6,513.90
  4. Step 4: Simplify right side
    11,891.54x = 106,892,317.33
  5. Step 5: Solve for x
    x = 106,892,317.33/11,891.54
  6. Step 6: Final answer
    x = 8,988.94

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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.