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Finding the Fourth Proportional to 931.76, 1,285.82 and 517.76

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Solution

The fourth proportional to 931.76, 1,285.82 and 517.76 is: 714.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.76 : 1,285.82 = 517.76 : x
  2. Step 2: Convert to fraction form
    931.76/1,285.82 = 517.76/x
  3. Step 3: Cross multiply
    931.76x = 1,285.82 × 517.76
  4. Step 4: Simplify right side
    931.76x = 665,746.16
  5. Step 5: Solve for x
    x = 665,746.16/931.76
  6. Step 6: Final answer
    x = 714.50

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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.