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Finding the Fourth Proportional to 915.97, 1,263.97 and 517.67

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Solution

The fourth proportional to 915.97, 1,263.97 and 517.67 is: 714.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.97 : 1,263.97 = 517.67 : x
  2. Step 2: Convert to fraction form
    915.97/1,263.97 = 517.67/x
  3. Step 3: Cross multiply
    915.97x = 1,263.97 × 517.67
  4. Step 4: Simplify right side
    915.97x = 654,314.56
  5. Step 5: Solve for x
    x = 654,314.56/915.97
  6. Step 6: Final answer
    x = 714.34

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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.