Home / 129,779.48-179,091.78-72,420.36

Finding the Fourth Proportional to 129,779.48, 179,091.78 and 72,420.36

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Solution

The fourth proportional to 129,779.48, 179,091.78 and 72,420.36 is: 99,937.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,779.48 : 179,091.78 = 72,420.36 : x
  2. Step 2: Convert to fraction form
    129,779.48/179,091.78 = 72,420.36/x
  3. Step 3: Cross multiply
    129,779.48x = 179,091.78 × 72,420.36
  4. Step 4: Simplify right side
    129,779.48x = 12,969,891,180.64
  5. Step 5: Solve for x
    x = 12,969,891,180.64/129,779.48
  6. Step 6: Final answer
    x = 99,937.92

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1.5x scale

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.