Home / 81,159.40-121,739.10-74,938.60

Finding the Fourth Proportional to 81,159.40, 121,739.10 and 74,938.60

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Solution

The fourth proportional to 81,159.40, 121,739.10 and 74,938.60 is: 112,407.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,159.40 : 121,739.10 = 74,938.60 : x
  2. Step 2: Convert to fraction form
    81,159.40/121,739.10 = 74,938.60/x
  3. Step 3: Cross multiply
    81,159.40x = 121,739.10 × 74,938.60
  4. Step 4: Simplify right side
    81,159.40x = 9,122,957,719.26
  5. Step 5: Solve for x
    x = 9,122,957,719.26/81,159.40
  6. Step 6: Final answer
    x = 112,407.90

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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.