Home / 86,221.28-129,159.12-39,409.76

Finding the Fourth Proportional to 86,221.28, 129,159.12 and 39,409.76

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Solution

The fourth proportional to 86,221.28, 129,159.12 and 39,409.76 is: 59,035.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,221.28 : 129,159.12 = 39,409.76 : x
  2. Step 2: Convert to fraction form
    86,221.28/129,159.12 = 39,409.76/x
  3. Step 3: Cross multiply
    86,221.28x = 129,159.12 × 39,409.76
  4. Step 4: Simplify right side
    86,221.28x = 5,090,129,921.01
  5. Step 5: Solve for x
    x = 5,090,129,921.01/86,221.28
  6. Step 6: Final answer
    x = 59,035.66

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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.