Home / 15,500.97-21,365.31-11,865.78

Finding the Fourth Proportional to 15,500.97, 21,365.31 and 11,865.78

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Solution

The fourth proportional to 15,500.97, 21,365.31 and 11,865.78 is: 16,354.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,500.97 : 21,365.31 = 11,865.78 : x
  2. Step 2: Convert to fraction form
    15,500.97/21,365.31 = 11,865.78/x
  3. Step 3: Cross multiply
    15,500.97x = 21,365.31 × 11,865.78
  4. Step 4: Simplify right side
    15,500.97x = 253,516,068.09
  5. Step 5: Solve for x
    x = 253,516,068.09/15,500.97
  6. Step 6: Final answer
    x = 16,354.85

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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.