Home / 81,145.60-121,747.56-71,406.16

Finding the Fourth Proportional to 81,145.60, 121,747.56 and 71,406.16

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Solution

The fourth proportional to 81,145.60, 121,747.56 and 71,406.16 is: 107,134.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,145.60 : 121,747.56 = 71,406.16 : x
  2. Step 2: Convert to fraction form
    81,145.60/121,747.56 = 71,406.16/x
  3. Step 3: Cross multiply
    81,145.60x = 121,747.56 × 71,406.16
  4. Step 4: Simplify right side
    81,145.60x = 8,693,525,748.97
  5. Step 5: Solve for x
    x = 8,693,525,748.97/81,145.60
  6. Step 6: Final answer
    x = 107,134.90

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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.