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Finding the Fourth Proportional to 865.23, 1,298.53 and 448.34

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Solution

The fourth proportional to 865.23, 1,298.53 and 448.34 is: 672.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.23 : 1,298.53 = 448.34 : x
  2. Step 2: Convert to fraction form
    865.23/1,298.53 = 448.34/x
  3. Step 3: Cross multiply
    865.23x = 1,298.53 × 448.34
  4. Step 4: Simplify right side
    865.23x = 582,177.01
  5. Step 5: Solve for x
    x = 582,177.01/865.23
  6. Step 6: Final answer
    x = 672.86

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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.