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Finding the Fourth Proportional to 915.72, 1,373.64 and 641.92

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Solution

The fourth proportional to 915.72, 1,373.64 and 641.92 is: 962.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.72 : 1,373.64 = 641.92 : x
  2. Step 2: Convert to fraction form
    915.72/1,373.64 = 641.92/x
  3. Step 3: Cross multiply
    915.72x = 1,373.64 × 641.92
  4. Step 4: Simplify right side
    915.72x = 881,766.99
  5. Step 5: Solve for x
    x = 881,766.99/915.72
  6. Step 6: Final answer
    x = 962.92

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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.