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Finding the Fourth Proportional to 865.45, 1,296.96 and 649.18

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Solution

The fourth proportional to 865.45, 1,296.96 and 649.18 is: 972.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.45 : 1,296.96 = 649.18 : x
  2. Step 2: Convert to fraction form
    865.45/1,296.96 = 649.18/x
  3. Step 3: Cross multiply
    865.45x = 1,296.96 × 649.18
  4. Step 4: Simplify right side
    865.45x = 841,960.49
  5. Step 5: Solve for x
    x = 841,960.49/865.45
  6. Step 6: Final answer
    x = 972.86

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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.