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Finding the Fourth Proportional to 417.67, 626.54 and 143.65

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Solution

The fourth proportional to 417.67, 626.54 and 143.65 is: 215.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.67 : 626.54 = 143.65 : x
  2. Step 2: Convert to fraction form
    417.67/626.54 = 143.65/x
  3. Step 3: Cross multiply
    417.67x = 626.54 × 143.65
  4. Step 4: Simplify right side
    417.67x = 90,002.47
  5. Step 5: Solve for x
    x = 90,002.47/417.67
  6. Step 6: Final answer
    x = 215.49

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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.