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Finding the Fourth Proportional to 787.62, 1,179.87 and 478.53

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Solution

The fourth proportional to 787.62, 1,179.87 and 478.53 is: 716.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.62 : 1,179.87 = 478.53 : x
  2. Step 2: Convert to fraction form
    787.62/1,179.87 = 478.53/x
  3. Step 3: Cross multiply
    787.62x = 1,179.87 × 478.53
  4. Step 4: Simplify right side
    787.62x = 564,603.19
  5. Step 5: Solve for x
    x = 564,603.19/787.62
  6. Step 6: Final answer
    x = 716.85

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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.