Home / 81,010.80-121,370.40-66,139.20

Finding the Fourth Proportional to 81,010.80, 121,370.40 and 66,139.20

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Solution

The fourth proportional to 81,010.80, 121,370.40 and 66,139.20 is: 99,089.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,010.80 : 121,370.40 = 66,139.20 : x
  2. Step 2: Convert to fraction form
    81,010.80/121,370.40 = 66,139.20/x
  3. Step 3: Cross multiply
    81,010.80x = 121,370.40 × 66,139.20
  4. Step 4: Simplify right side
    81,010.80x = 8,027,341,159.68
  5. Step 5: Solve for x
    x = 8,027,341,159.68/81,010.80
  6. Step 6: Final answer
    x = 99,089.77

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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.