Home / 129,778.48-179,090.40-72,419.36

Finding the Fourth Proportional to 129,778.48, 179,090.40 and 72,419.36

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Solution

The fourth proportional to 129,778.48, 179,090.40 and 72,419.36 is: 99,936.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,778.48 : 179,090.40 = 72,419.36 : x
  2. Step 2: Convert to fraction form
    129,778.48/179,090.40 = 72,419.36/x
  3. Step 3: Cross multiply
    129,778.48x = 179,090.40 × 72,419.36
  4. Step 4: Simplify right side
    129,778.48x = 12,969,612,150.14
  5. Step 5: Solve for x
    x = 12,969,612,150.14/129,778.48
  6. Step 6: Final answer
    x = 99,936.54

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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.