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Finding the Fourth Proportional to 915.45, 1,372.53 and 428.24

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Solution

The fourth proportional to 915.45, 1,372.53 and 428.24 is: 642.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.45 : 1,372.53 = 428.24 : x
  2. Step 2: Convert to fraction form
    915.45/1,372.53 = 428.24/x
  3. Step 3: Cross multiply
    915.45x = 1,372.53 × 428.24
  4. Step 4: Simplify right side
    915.45x = 587,765.95
  5. Step 5: Solve for x
    x = 587,765.95/915.45
  6. Step 6: Final answer
    x = 642.05

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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.