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Finding the Fourth Proportional to 915.32, 1,372.10 and 422.06

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Solution

The fourth proportional to 915.32, 1,372.10 and 422.06 is: 632.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.32 : 1,372.10 = 422.06 : x
  2. Step 2: Convert to fraction form
    915.32/1,372.10 = 422.06/x
  3. Step 3: Cross multiply
    915.32x = 1,372.10 × 422.06
  4. Step 4: Simplify right side
    915.32x = 579,103.38
  5. Step 5: Solve for x
    x = 579,103.38/915.32
  6. Step 6: Final answer
    x = 632.68

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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.