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Finding the Fourth Proportional to 79,854.56, 119,781.86 and 20,690.24

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Solution

The fourth proportional to 79,854.56, 119,781.86 and 20,690.24 is: 31,035.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,854.56 : 119,781.86 = 20,690.24 : x
  2. Step 2: Convert to fraction form
    79,854.56/119,781.86 = 20,690.24/x
  3. Step 3: Cross multiply
    79,854.56x = 119,781.86 × 20,690.24
  4. Step 4: Simplify right side
    79,854.56x = 2,478,314,728.69
  5. Step 5: Solve for x
    x = 2,478,314,728.69/79,854.56
  6. Step 6: Final answer
    x = 31,035.36

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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.