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Finding the Fourth Proportional to 129,718.92, 178,984.86 and 78,758.44

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Solution

The fourth proportional to 129,718.92, 178,984.86 and 78,758.44 is: 108,670.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,718.92 : 178,984.86 = 78,758.44 : x
  2. Step 2: Convert to fraction form
    129,718.92/178,984.86 = 78,758.44/x
  3. Step 3: Cross multiply
    129,718.92x = 178,984.86 × 78,758.44
  4. Step 4: Simplify right side
    129,718.92x = 14,096,568,357.22
  5. Step 5: Solve for x
    x = 14,096,568,357.22/129,718.92
  6. Step 6: Final answer
    x = 108,670.10

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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.