Home / 129,805.12-179,133.40-76,128.86

Finding the Fourth Proportional to 129,805.12, 179,133.40 and 76,128.86

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Solution

The fourth proportional to 129,805.12, 179,133.40 and 76,128.86 is: 105,059.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,805.12 : 179,133.40 = 76,128.86 : x
  2. Step 2: Convert to fraction form
    129,805.12/179,133.40 = 76,128.86/x
  3. Step 3: Cross multiply
    129,805.12x = 179,133.40 × 76,128.86
  4. Step 4: Simplify right side
    129,805.12x = 13,637,221,529.92
  5. Step 5: Solve for x
    x = 13,637,221,529.92/129,805.12
  6. Step 6: Final answer
    x = 105,059.20

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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.