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Finding the Fourth Proportional to 8,787.79, 12,129.90 and 5,432.09

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Solution

The fourth proportional to 8,787.79, 12,129.90 and 5,432.09 is: 7,497.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,787.79 : 12,129.90 = 5,432.09 : x
  2. Step 2: Convert to fraction form
    8,787.79/12,129.90 = 5,432.09/x
  3. Step 3: Cross multiply
    8,787.79x = 12,129.90 × 5,432.09
  4. Step 4: Simplify right side
    8,787.79x = 65,890,708.49
  5. Step 5: Solve for x
    x = 65,890,708.49/8,787.79
  6. Step 6: Final answer
    x = 7,497.99

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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.