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Finding the Fourth Proportional to 417.79, 626.73 and 143.85

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Solution

The fourth proportional to 417.79, 626.73 and 143.85 is: 215.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.79 : 626.73 = 143.85 : x
  2. Step 2: Convert to fraction form
    417.79/626.73 = 143.85/x
  3. Step 3: Cross multiply
    417.79x = 626.73 × 143.85
  4. Step 4: Simplify right side
    417.79x = 90,152.22
  5. Step 5: Solve for x
    x = 90,152.22/417.79
  6. Step 6: Final answer
    x = 215.78

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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.