Home / 129,329.28-178,521.60-81,613.68

Finding the Fourth Proportional to 129,329.28, 178,521.60 and 81,613.68

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Solution

The fourth proportional to 129,329.28, 178,521.60 and 81,613.68 is: 112,656.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,329.28 : 178,521.60 = 81,613.68 : x
  2. Step 2: Convert to fraction form
    129,329.28/178,521.60 = 81,613.68/x
  3. Step 3: Cross multiply
    129,329.28x = 178,521.60 × 81,613.68
  4. Step 4: Simplify right side
    129,329.28x = 14,569,804,735.49
  5. Step 5: Solve for x
    x = 14,569,804,735.49/129,329.28
  6. Step 6: Final answer
    x = 112,656.66

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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.