Home / 129,146.81-178,212.34-71,781.62

Finding the Fourth Proportional to 129,146.81, 178,212.34 and 71,781.62

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Solution

The fourth proportional to 129,146.81, 178,212.34 and 71,781.62 is: 99,052.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,146.81 : 178,212.34 = 71,781.62 : x
  2. Step 2: Convert to fraction form
    129,146.81/178,212.34 = 71,781.62/x
  3. Step 3: Cross multiply
    129,146.81x = 178,212.34 × 71,781.62
  4. Step 4: Simplify right side
    129,146.81x = 12,792,370,469.19
  5. Step 5: Solve for x
    x = 12,792,370,469.19/129,146.81
  6. Step 6: Final answer
    x = 99,052.93

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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.