Home / 129,378.24-178,542.36-72,788.40

Finding the Fourth Proportional to 129,378.24, 178,542.36 and 72,788.40

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Solution

The fourth proportional to 129,378.24, 178,542.36 and 72,788.40 is: 100,448.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,378.24 : 178,542.36 = 72,788.40 : x
  2. Step 2: Convert to fraction form
    129,378.24/178,542.36 = 72,788.40/x
  3. Step 3: Cross multiply
    129,378.24x = 178,542.36 × 72,788.40
  4. Step 4: Simplify right side
    129,378.24x = 12,995,812,716.62
  5. Step 5: Solve for x
    x = 12,995,812,716.62/129,378.24
  6. Step 6: Final answer
    x = 100,448.21

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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.