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Finding the Fourth Proportional to 425,432.40, 638,105.40 and 144,945.60

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Solution

The fourth proportional to 425,432.40, 638,105.40 and 144,945.60 is: 217,403.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,432.40 : 638,105.40 = 144,945.60 : x
  2. Step 2: Convert to fraction form
    425,432.40/638,105.40 = 144,945.60/x
  3. Step 3: Cross multiply
    425,432.40x = 638,105.40 × 144,945.60
  4. Step 4: Simplify right side
    425,432.40x = 92,490,570,066.24
  5. Step 5: Solve for x
    x = 92,490,570,066.24/425,432.40
  6. Step 6: Final answer
    x = 217,403.68

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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.