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Finding the Fourth Proportional to 717.19, 1,078.85 and 624.92

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Solution

The fourth proportional to 717.19, 1,078.85 and 624.92 is: 940.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.19 : 1,078.85 = 624.92 : x
  2. Step 2: Convert to fraction form
    717.19/1,078.85 = 624.92/x
  3. Step 3: Cross multiply
    717.19x = 1,078.85 × 624.92
  4. Step 4: Simplify right side
    717.19x = 674,191.11
  5. Step 5: Solve for x
    x = 674,191.11/717.19
  6. Step 6: Final answer
    x = 940.05

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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.