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Finding the Fourth Proportional to 865.79, 1,298.90 and 249.54

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Solution

The fourth proportional to 865.79, 1,298.90 and 249.54 is: 374.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.79 : 1,298.90 = 249.54 : x
  2. Step 2: Convert to fraction form
    865.79/1,298.90 = 249.54/x
  3. Step 3: Cross multiply
    865.79x = 1,298.90 × 249.54
  4. Step 4: Simplify right side
    865.79x = 324,128.13
  5. Step 5: Solve for x
    x = 324,128.13/865.79
  6. Step 6: Final answer
    x = 374.37

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Double scale
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1.5x scale

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.