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Finding the Fourth Proportional to 725.79, 1,087.80 and 417.78

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Solution

The fourth proportional to 725.79, 1,087.80 and 417.78 is: 626.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.79 : 1,087.80 = 417.78 : x
  2. Step 2: Convert to fraction form
    725.79/1,087.80 = 417.78/x
  3. Step 3: Cross multiply
    725.79x = 1,087.80 × 417.78
  4. Step 4: Simplify right side
    725.79x = 454,461.08
  5. Step 5: Solve for x
    x = 454,461.08/725.79
  6. Step 6: Final answer
    x = 626.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.