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Finding the Fourth Proportional to 81,079.72, 121,613.58 and 28,489.72

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Solution

The fourth proportional to 81,079.72, 121,613.58 and 28,489.72 is: 42,732.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,079.72 : 121,613.58 = 28,489.72 : x
  2. Step 2: Convert to fraction form
    81,079.72/121,613.58 = 28,489.72/x
  3. Step 3: Cross multiply
    81,079.72x = 121,613.58 × 28,489.72
  4. Step 4: Simplify right side
    81,079.72x = 3,464,736,842.40
  5. Step 5: Solve for x
    x = 3,464,736,842.40/81,079.72
  6. Step 6: Final answer
    x = 42,732.47

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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.