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Finding the Fourth Proportional to 717.86, 1,081.32 and 641.72

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Solution

The fourth proportional to 717.86, 1,081.32 and 641.72 is: 966.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.86 : 1,081.32 = 641.72 : x
  2. Step 2: Convert to fraction form
    717.86/1,081.32 = 641.72/x
  3. Step 3: Cross multiply
    717.86x = 1,081.32 × 641.72
  4. Step 4: Simplify right side
    717.86x = 693,899.26
  5. Step 5: Solve for x
    x = 693,899.26/717.86
  6. Step 6: Final answer
    x = 966.63

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.