Home / 129,145.92-178,220.18-71,783.76

Finding the Fourth Proportional to 129,145.92, 178,220.18 and 71,783.76

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Solution

The fourth proportional to 129,145.92, 178,220.18 and 71,783.76 is: 99,060.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,145.92 : 178,220.18 = 71,783.76 : x
  2. Step 2: Convert to fraction form
    129,145.92/178,220.18 = 71,783.76/x
  3. Step 3: Cross multiply
    129,145.92x = 178,220.18 × 71,783.76
  4. Step 4: Simplify right side
    129,145.92x = 12,793,314,628.28
  5. Step 5: Solve for x
    x = 12,793,314,628.28/129,145.92
  6. Step 6: Final answer
    x = 99,060.93

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Double scale
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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.