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Finding the Fourth Proportional to 915.26, 1,372.82 and 813.70

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Solution

The fourth proportional to 915.26, 1,372.82 and 813.70 is: 1,220.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.26 : 1,372.82 = 813.70 : x
  2. Step 2: Convert to fraction form
    915.26/1,372.82 = 813.70/x
  3. Step 3: Cross multiply
    915.26x = 1,372.82 × 813.70
  4. Step 4: Simplify right side
    915.26x = 1,117,063.63
  5. Step 5: Solve for x
    x = 1,117,063.63/915.26
  6. Step 6: Final answer
    x = 1,220.49

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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.