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Finding the Fourth Proportional to 12,990.51, 17,926.96 and 8,212.55

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Solution

The fourth proportional to 12,990.51, 17,926.96 and 8,212.55 is: 11,333.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.51 : 17,926.96 = 8,212.55 : x
  2. Step 2: Convert to fraction form
    12,990.51/17,926.96 = 8,212.55/x
  3. Step 3: Cross multiply
    12,990.51x = 17,926.96 × 8,212.55
  4. Step 4: Simplify right side
    12,990.51x = 147,226,034.10
  5. Step 5: Solve for x
    x = 147,226,034.10/12,990.51
  6. Step 6: Final answer
    x = 11,333.35

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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.