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Finding the Fourth Proportional to 787.89, 1,087.49 and 456.51

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Solution

The fourth proportional to 787.89, 1,087.49 and 456.51 is: 630.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.89 : 1,087.49 = 456.51 : x
  2. Step 2: Convert to fraction form
    787.89/1,087.49 = 456.51/x
  3. Step 3: Cross multiply
    787.89x = 1,087.49 × 456.51
  4. Step 4: Simplify right side
    787.89x = 496,447.78
  5. Step 5: Solve for x
    x = 496,447.78/787.89
  6. Step 6: Final answer
    x = 630.10

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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.