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Finding the Fourth Proportional to 865.77, 1,298.50 and 317.97

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Solution

The fourth proportional to 865.77, 1,298.50 and 317.97 is: 476.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.77 : 1,298.50 = 317.97 : x
  2. Step 2: Convert to fraction form
    865.77/1,298.50 = 317.97/x
  3. Step 3: Cross multiply
    865.77x = 1,298.50 × 317.97
  4. Step 4: Simplify right side
    865.77x = 412,884.05
  5. Step 5: Solve for x
    x = 412,884.05/865.77
  6. Step 6: Final answer
    x = 476.90

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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.