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Finding the Fourth Proportional to 787.28, 1,086.37 and 472.55

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Solution

The fourth proportional to 787.28, 1,086.37 and 472.55 is: 652.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.28 : 1,086.37 = 472.55 : x
  2. Step 2: Convert to fraction form
    787.28/1,086.37 = 472.55/x
  3. Step 3: Cross multiply
    787.28x = 1,086.37 × 472.55
  4. Step 4: Simplify right side
    787.28x = 513,357.53
  5. Step 5: Solve for x
    x = 513,357.53/787.28
  6. Step 6: Final answer
    x = 652.07

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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.