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Finding the Fourth Proportional to 915.04, 1,372 and 658

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Solution

The fourth proportional to 915.04, 1,372 and 658 is: 986.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.04 : 1,372 = 658 : x
  2. Step 2: Convert to fraction form
    915.04/1,372 = 658/x
  3. Step 3: Cross multiply
    915.04x = 1,372 × 658
  4. Step 4: Simplify right side
    915.04x = 902,776
  5. Step 5: Solve for x
    x = 902,776/915.04
  6. Step 6: Final answer
    x = 986.60

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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.