Home / 129,715.18-178,986.40-73,115.62

Finding the Fourth Proportional to 129,715.18, 178,986.40 and 73,115.62

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Solution

The fourth proportional to 129,715.18, 178,986.40 and 73,115.62 is: 100,887.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,715.18 : 178,986.40 = 73,115.62 : x
  2. Step 2: Convert to fraction form
    129,715.18/178,986.40 = 73,115.62/x
  3. Step 3: Cross multiply
    129,715.18x = 178,986.40 × 73,115.62
  4. Step 4: Simplify right side
    129,715.18x = 13,086,701,607.57
  5. Step 5: Solve for x
    x = 13,086,701,607.57/129,715.18
  6. Step 6: Final answer
    x = 100,887.97

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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.