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Finding the Fourth Proportional to 915.86, 1,372.91 and 680.99

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Solution

The fourth proportional to 915.86, 1,372.91 and 680.99 is: 1,020.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.86 : 1,372.91 = 680.99 : x
  2. Step 2: Convert to fraction form
    915.86/1,372.91 = 680.99/x
  3. Step 3: Cross multiply
    915.86x = 1,372.91 × 680.99
  4. Step 4: Simplify right side
    915.86x = 934,937.33
  5. Step 5: Solve for x
    x = 934,937.33/915.86
  6. Step 6: Final answer
    x = 1,020.83

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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.