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Finding the Fourth Proportional to 28,287, 39,037.32 and 15,711.72

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Solution

The fourth proportional to 28,287, 39,037.32 and 15,711.72 is: 21,682.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,287 : 39,037.32 = 15,711.72 : x
  2. Step 2: Convert to fraction form
    28,287/39,037.32 = 15,711.72/x
  3. Step 3: Cross multiply
    28,287x = 39,037.32 × 15,711.72
  4. Step 4: Simplify right side
    28,287x = 613,343,441.39
  5. Step 5: Solve for x
    x = 613,343,441.39/28,287
  6. Step 6: Final answer
    x = 21,682.87

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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.