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Finding the Fourth Proportional to 787.61, 1,086.93 and 438.29

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Solution

The fourth proportional to 787.61, 1,086.93 and 438.29 is: 604.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.61 : 1,086.93 = 438.29 : x
  2. Step 2: Convert to fraction form
    787.61/1,086.93 = 438.29/x
  3. Step 3: Cross multiply
    787.61x = 1,086.93 × 438.29
  4. Step 4: Simplify right side
    787.61x = 476,390.55
  5. Step 5: Solve for x
    x = 476,390.55/787.61
  6. Step 6: Final answer
    x = 604.86

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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.