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Finding the Fourth Proportional to 83, 124.30 and 72.94

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Solution

The fourth proportional to 83, 124.30 and 72.94 is: 109.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    83 : 124.30 = 72.94 : x
  2. Step 2: Convert to fraction form
    83/124.30 = 72.94/x
  3. Step 3: Cross multiply
    83x = 124.30 × 72.94
  4. Step 4: Simplify right side
    83x = 9,066.44
  5. Step 5: Solve for x
    x = 9,066.44/83
  6. Step 6: Final answer
    x = 109.23

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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.