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Finding the Fourth Proportional to 787.23, 1,086.57 and 521.73

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Solution

The fourth proportional to 787.23, 1,086.57 and 521.73 is: 720.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.23 : 1,086.57 = 521.73 : x
  2. Step 2: Convert to fraction form
    787.23/1,086.57 = 521.73/x
  3. Step 3: Cross multiply
    787.23x = 1,086.57 × 521.73
  4. Step 4: Simplify right side
    787.23x = 566,896.17
  5. Step 5: Solve for x
    x = 566,896.17/787.23
  6. Step 6: Final answer
    x = 720.12

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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.