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Finding the Fourth Proportional to 81,117.80, 111,945.75 and 47,125.88

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Solution

The fourth proportional to 81,117.80, 111,945.75 and 47,125.88 is: 65,035.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,117.80 : 111,945.75 = 47,125.88 : x
  2. Step 2: Convert to fraction form
    81,117.80/111,945.75 = 47,125.88/x
  3. Step 3: Cross multiply
    81,117.80x = 111,945.75 × 47,125.88
  4. Step 4: Simplify right side
    81,117.80x = 5,275,541,981.01
  5. Step 5: Solve for x
    x = 5,275,541,981.01/81,117.80
  6. Step 6: Final answer
    x = 65,035.57

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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.