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Finding the Fourth Proportional to 865.17, 1,296.74 and 426.62

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Solution

The fourth proportional to 865.17, 1,296.74 and 426.62 is: 639.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.17 : 1,296.74 = 426.62 : x
  2. Step 2: Convert to fraction form
    865.17/1,296.74 = 426.62/x
  3. Step 3: Cross multiply
    865.17x = 1,296.74 × 426.62
  4. Step 4: Simplify right side
    865.17x = 553,219.53
  5. Step 5: Solve for x
    x = 553,219.53/865.17
  6. Step 6: Final answer
    x = 639.43

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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.