Home / 129,379.16-178,542.95-72,790.53

Finding the Fourth Proportional to 129,379.16, 178,542.95 and 72,790.53

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Solution

The fourth proportional to 129,379.16, 178,542.95 and 72,790.53 is: 100,450.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,379.16 : 178,542.95 = 72,790.53 : x
  2. Step 2: Convert to fraction form
    129,379.16/178,542.95 = 72,790.53/x
  3. Step 3: Cross multiply
    129,379.16x = 178,542.95 × 72,790.53
  4. Step 4: Simplify right side
    129,379.16x = 12,996,235,594.31
  5. Step 5: Solve for x
    x = 12,996,235,594.31/129,379.16
  6. Step 6: Final answer
    x = 100,450.77

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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.