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Finding the Fourth Proportional to 20,597.71, 28,404.36 and 15,505.41

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Solution

The fourth proportional to 20,597.71, 28,404.36 and 15,505.41 is: 21,382.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,597.71 : 28,404.36 = 15,505.41 : x
  2. Step 2: Convert to fraction form
    20,597.71/28,404.36 = 15,505.41/x
  3. Step 3: Cross multiply
    20,597.71x = 28,404.36 × 15,505.41
  4. Step 4: Simplify right side
    20,597.71x = 440,421,390.48
  5. Step 5: Solve for x
    x = 440,421,390.48/20,597.71
  6. Step 6: Final answer
    x = 21,382.06

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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.