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Finding the Fourth Proportional to 425,660.32, 638,430.24 and 126,172.56

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Solution

The fourth proportional to 425,660.32, 638,430.24 and 126,172.56 is: 189,240.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,660.32 : 638,430.24 = 126,172.56 : x
  2. Step 2: Convert to fraction form
    425,660.32/638,430.24 = 126,172.56/x
  3. Step 3: Cross multiply
    425,660.32x = 638,430.24 × 126,172.56
  4. Step 4: Simplify right side
    425,660.32x = 80,552,377,762.21
  5. Step 5: Solve for x
    x = 80,552,377,762.21/425,660.32
  6. Step 6: Final answer
    x = 189,240.98

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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.