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Finding the Fourth Proportional to 425,999.20, 638,755.80 and 159,768.40

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Solution

The fourth proportional to 425,999.20, 638,755.80 and 159,768.40 is: 239,561.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,999.20 : 638,755.80 = 159,768.40 : x
  2. Step 2: Convert to fraction form
    425,999.20/638,755.80 = 159,768.40/x
  3. Step 3: Cross multiply
    425,999.20x = 638,755.80 × 159,768.40
  4. Step 4: Simplify right side
    425,999.20x = 102,052,992,156.72
  5. Step 5: Solve for x
    x = 102,052,992,156.72/425,999.20
  6. Step 6: Final answer
    x = 239,561.46

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1.5x scale

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.