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Finding the Fourth Proportional to 80,864.69, 120,728.44 and 61,789.49

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Solution

The fourth proportional to 80,864.69, 120,728.44 and 61,789.49 is: 92,249.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,864.69 : 120,728.44 = 61,789.49 : x
  2. Step 2: Convert to fraction form
    80,864.69/120,728.44 = 61,789.49/x
  3. Step 3: Cross multiply
    80,864.69x = 120,728.44 × 61,789.49
  4. Step 4: Simplify right side
    80,864.69x = 7,459,748,314.86
  5. Step 5: Solve for x
    x = 7,459,748,314.86/80,864.69
  6. Step 6: Final answer
    x = 92,249.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.