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Finding the Fourth Proportional to 612.67, 915.77 and 531.31

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Solution

The fourth proportional to 612.67, 915.77 and 531.31 is: 794.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.67 : 915.77 = 531.31 : x
  2. Step 2: Convert to fraction form
    612.67/915.77 = 531.31/x
  3. Step 3: Cross multiply
    612.67x = 915.77 × 531.31
  4. Step 4: Simplify right side
    612.67x = 486,557.76
  5. Step 5: Solve for x
    x = 486,557.76/612.67
  6. Step 6: Final answer
    x = 794.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.