Home / 420,207.75-630,317.09-139,725

Finding the Fourth Proportional to 420,207.75, 630,317.09 and 139,725

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Solution

The fourth proportional to 420,207.75, 630,317.09 and 139,725 is: 209,589.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,207.75 : 630,317.09 = 139,725 : x
  2. Step 2: Convert to fraction form
    420,207.75/630,317.09 = 139,725/x
  3. Step 3: Cross multiply
    420,207.75x = 630,317.09 × 139,725
  4. Step 4: Simplify right side
    420,207.75x = 88,071,055,749.56
  5. Step 5: Solve for x
    x = 88,071,055,749.56/420,207.75
  6. Step 6: Final answer
    x = 209,589.32

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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.