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Finding the Fourth Proportional to 662.40, 915.39 and 531.18

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Solution

The fourth proportional to 662.40, 915.39 and 531.18 is: 734.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.40 : 915.39 = 531.18 : x
  2. Step 2: Convert to fraction form
    662.40/915.39 = 531.18/x
  3. Step 3: Cross multiply
    662.40x = 915.39 × 531.18
  4. Step 4: Simplify right side
    662.40x = 486,236.86
  5. Step 5: Solve for x
    x = 486,236.86/662.40
  6. Step 6: Final answer
    x = 734.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.