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Finding the Fourth Proportional to 915.26, 1,373.34 and 428.35

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Solution

The fourth proportional to 915.26, 1,373.34 and 428.35 is: 642.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.26 : 1,373.34 = 428.35 : x
  2. Step 2: Convert to fraction form
    915.26/1,373.34 = 428.35/x
  3. Step 3: Cross multiply
    915.26x = 1,373.34 × 428.35
  4. Step 4: Simplify right side
    915.26x = 588,263.32
  5. Step 5: Solve for x
    x = 588,263.32/915.26
  6. Step 6: Final answer
    x = 642.73

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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.