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Finding the Fourth Proportional to 425,640.47, 638,463.02 and 126,123.64

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Solution

The fourth proportional to 425,640.47, 638,463.02 and 126,123.64 is: 189,186.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,640.47 : 638,463.02 = 126,123.64 : x
  2. Step 2: Convert to fraction form
    425,640.47/638,463.02 = 126,123.64/x
  3. Step 3: Cross multiply
    425,640.47x = 638,463.02 × 126,123.64
  4. Step 4: Simplify right side
    425,640.47x = 80,525,281,452.37
  5. Step 5: Solve for x
    x = 80,525,281,452.37/425,640.47
  6. Step 6: Final answer
    x = 189,186.15

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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.