Home / 129,130.20-178,170.50-78,141.65

Finding the Fourth Proportional to 129,130.20, 178,170.50 and 78,141.65

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Solution

The fourth proportional to 129,130.20, 178,170.50 and 78,141.65 is: 107,817.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,130.20 : 178,170.50 = 78,141.65 : x
  2. Step 2: Convert to fraction form
    129,130.20/178,170.50 = 78,141.65/x
  3. Step 3: Cross multiply
    129,130.20x = 178,170.50 × 78,141.65
  4. Step 4: Simplify right side
    129,130.20x = 13,922,536,155.83
  5. Step 5: Solve for x
    x = 13,922,536,155.83/129,130.20
  6. Step 6: Final answer
    x = 107,817.82

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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.