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Finding the Fourth Proportional to 425,605.32, 638,501.28 and 126,109.44

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Solution

The fourth proportional to 425,605.32, 638,501.28 and 126,109.44 is: 189,191.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,605.32 : 638,501.28 = 126,109.44 : x
  2. Step 2: Convert to fraction form
    425,605.32/638,501.28 = 126,109.44/x
  3. Step 3: Cross multiply
    425,605.32x = 638,501.28 × 126,109.44
  4. Step 4: Simplify right side
    425,605.32x = 80,521,038,860.08
  5. Step 5: Solve for x
    x = 80,521,038,860.08/425,605.32
  6. Step 6: Final answer
    x = 189,191.81

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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.