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Finding the Fourth Proportional to 28,510.38, 42,771.87 and 9,789.99

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Solution

The fourth proportional to 28,510.38, 42,771.87 and 9,789.99 is: 14,687.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,510.38 : 42,771.87 = 9,789.99 : x
  2. Step 2: Convert to fraction form
    28,510.38/42,771.87 = 9,789.99/x
  3. Step 3: Cross multiply
    28,510.38x = 42,771.87 × 9,789.99
  4. Step 4: Simplify right side
    28,510.38x = 418,736,179.58
  5. Step 5: Solve for x
    x = 418,736,179.58/28,510.38
  6. Step 6: Final answer
    x = 14,687.15

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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.