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Finding the Fourth Proportional to 787.83, 1,087.41 and 456.49

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Solution

The fourth proportional to 787.83, 1,087.41 and 456.49 is: 630.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.83 : 1,087.41 = 456.49 : x
  2. Step 2: Convert to fraction form
    787.83/1,087.41 = 456.49/x
  3. Step 3: Cross multiply
    787.83x = 1,087.41 × 456.49
  4. Step 4: Simplify right side
    787.83x = 496,391.79
  5. Step 5: Solve for x
    x = 496,391.79/787.83
  6. Step 6: Final answer
    x = 630.07

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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.