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Finding the Fourth Proportional to 28,508.38, 42,768.87 and 9,787.99

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Solution

The fourth proportional to 28,508.38, 42,768.87 and 9,787.99 is: 14,684.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,508.38 : 42,768.87 = 9,787.99 : x
  2. Step 2: Convert to fraction form
    28,508.38/42,768.87 = 9,787.99/x
  3. Step 3: Cross multiply
    28,508.38x = 42,768.87 × 9,787.99
  4. Step 4: Simplify right side
    28,508.38x = 418,621,271.87
  5. Step 5: Solve for x
    x = 418,621,271.87/28,508.38
  6. Step 6: Final answer
    x = 14,684.15

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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.