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Finding the Fourth Proportional to 915.31, 1,372.31 and 428.10

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Solution

The fourth proportional to 915.31, 1,372.31 and 428.10 is: 641.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.31 : 1,372.31 = 428.10 : x
  2. Step 2: Convert to fraction form
    915.31/1,372.31 = 428.10/x
  3. Step 3: Cross multiply
    915.31x = 1,372.31 × 428.10
  4. Step 4: Simplify right side
    915.31x = 587,482.64
  5. Step 5: Solve for x
    x = 587,482.64/915.31
  6. Step 6: Final answer
    x = 641.84

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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.