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Finding the Fourth Proportional to 865.61, 1,297.51 and 648.53

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Solution

The fourth proportional to 865.61, 1,297.51 and 648.53 is: 972.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.61 : 1,297.51 = 648.53 : x
  2. Step 2: Convert to fraction form
    865.61/1,297.51 = 648.53/x
  3. Step 3: Cross multiply
    865.61x = 1,297.51 × 648.53
  4. Step 4: Simplify right side
    865.61x = 841,474.16
  5. Step 5: Solve for x
    x = 841,474.16/865.61
  6. Step 6: Final answer
    x = 972.12

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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.