Home / 425,619.40-638,105.10-215,408.20

Finding the Fourth Proportional to 425,619.40, 638,105.10 and 215,408.20

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Solution

The fourth proportional to 425,619.40, 638,105.10 and 215,408.20 is: 322,948.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,619.40 : 638,105.10 = 215,408.20 : x
  2. Step 2: Convert to fraction form
    425,619.40/638,105.10 = 215,408.20/x
  3. Step 3: Cross multiply
    425,619.40x = 638,105.10 × 215,408.20
  4. Step 4: Simplify right side
    425,619.40x = 137,453,071,001.82
  5. Step 5: Solve for x
    x = 137,453,071,001.82/425,619.40
  6. Step 6: Final answer
    x = 322,948.32

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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.