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Finding the Fourth Proportional to 28,489.87, 42,731.56 and 7,711.75

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Solution

The fourth proportional to 28,489.87, 42,731.56 and 7,711.75 is: 11,566.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,489.87 : 42,731.56 = 7,711.75 : x
  2. Step 2: Convert to fraction form
    28,489.87/42,731.56 = 7,711.75/x
  3. Step 3: Cross multiply
    28,489.87x = 42,731.56 × 7,711.75
  4. Step 4: Simplify right side
    28,489.87x = 329,535,107.83
  5. Step 5: Solve for x
    x = 329,535,107.83/28,489.87
  6. Step 6: Final answer
    x = 11,566.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.