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Finding the Fourth Proportional to 787.76, 1,087.10 and 456.23

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Solution

The fourth proportional to 787.76, 1,087.10 and 456.23 is: 629.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.76 : 1,087.10 = 456.23 : x
  2. Step 2: Convert to fraction form
    787.76/1,087.10 = 456.23/x
  3. Step 3: Cross multiply
    787.76x = 1,087.10 × 456.23
  4. Step 4: Simplify right side
    787.76x = 495,959.92
  5. Step 5: Solve for x
    x = 495,959.92/787.76
  6. Step 6: Final answer
    x = 629.59

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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.