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Finding the Fourth Proportional to 100,879.72, 139,195.62 and 58,422.76

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Solution

The fourth proportional to 100,879.72, 139,195.62 and 58,422.76 is: 80,612.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,879.72 : 139,195.62 = 58,422.76 : x
  2. Step 2: Convert to fraction form
    100,879.72/139,195.62 = 58,422.76/x
  3. Step 3: Cross multiply
    100,879.72x = 139,195.62 × 58,422.76
  4. Step 4: Simplify right side
    100,879.72x = 8,132,192,300.31
  5. Step 5: Solve for x
    x = 8,132,192,300.31/100,879.72
  6. Step 6: Final answer
    x = 80,612.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.