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Finding the Fourth Proportional to 265.72, 398.65 and 83.12

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Solution

The fourth proportional to 265.72, 398.65 and 83.12 is: 124.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.72 : 398.65 = 83.12 : x
  2. Step 2: Convert to fraction form
    265.72/398.65 = 83.12/x
  3. Step 3: Cross multiply
    265.72x = 398.65 × 83.12
  4. Step 4: Simplify right side
    265.72x = 33,133.79
  5. Step 5: Solve for x
    x = 33,133.79/265.72
  6. Step 6: Final answer
    x = 124.69

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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.