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Finding the Fourth Proportional to 417.31, 625.99 and 139.65

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Solution

The fourth proportional to 417.31, 625.99 and 139.65 is: 209.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.31 : 625.99 = 139.65 : x
  2. Step 2: Convert to fraction form
    417.31/625.99 = 139.65/x
  3. Step 3: Cross multiply
    417.31x = 625.99 × 139.65
  4. Step 4: Simplify right side
    417.31x = 87,420.59
  5. Step 5: Solve for x
    x = 87,420.59/417.31
  6. Step 6: Final answer
    x = 209.49

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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.