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Finding the Fourth Proportional to 81,151.43, 111,980.76 and 55,679.72

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Solution

The fourth proportional to 81,151.43, 111,980.76 and 55,679.72 is: 76,832.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,151.43 : 111,980.76 = 55,679.72 : x
  2. Step 2: Convert to fraction form
    81,151.43/111,980.76 = 55,679.72/x
  3. Step 3: Cross multiply
    81,151.43x = 111,980.76 × 55,679.72
  4. Step 4: Simplify right side
    81,151.43x = 6,235,056,802.28
  5. Step 5: Solve for x
    x = 6,235,056,802.28/81,151.43
  6. Step 6: Final answer
    x = 76,832.38

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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.