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Finding the Fourth Proportional to 426,010.76, 639,148.75 and 126,492.91

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Solution

The fourth proportional to 426,010.76, 639,148.75 and 126,492.91 is: 189,778.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,010.76 : 639,148.75 = 126,492.91 : x
  2. Step 2: Convert to fraction form
    426,010.76/639,148.75 = 126,492.91/x
  3. Step 3: Cross multiply
    426,010.76x = 639,148.75 × 126,492.91
  4. Step 4: Simplify right side
    426,010.76x = 80,847,785,793.07
  5. Step 5: Solve for x
    x = 80,847,785,793.07/426,010.76
  6. Step 6: Final answer
    x = 189,778.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.