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Finding the Fourth Proportional to 4,787.76, 6,607.20 and 2,691.90

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Solution

The fourth proportional to 4,787.76, 6,607.20 and 2,691.90 is: 3,714.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,787.76 : 6,607.20 = 2,691.90 : x
  2. Step 2: Convert to fraction form
    4,787.76/6,607.20 = 2,691.90/x
  3. Step 3: Cross multiply
    4,787.76x = 6,607.20 × 2,691.90
  4. Step 4: Simplify right side
    4,787.76x = 17,785,921.68
  5. Step 5: Solve for x
    x = 17,785,921.68/4,787.76
  6. Step 6: Final answer
    x = 3,714.87

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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.