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Finding the Fourth Proportional to 787.74, 1,087.17 and 488.93

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Solution

The fourth proportional to 787.74, 1,087.17 and 488.93 is: 674.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.74 : 1,087.17 = 488.93 : x
  2. Step 2: Convert to fraction form
    787.74/1,087.17 = 488.93/x
  3. Step 3: Cross multiply
    787.74x = 1,087.17 × 488.93
  4. Step 4: Simplify right side
    787.74x = 531,550.03
  5. Step 5: Solve for x
    x = 531,550.03/787.74
  6. Step 6: Final answer
    x = 674.78

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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.