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Finding the Fourth Proportional to 417.42, 626.20 and 143.50

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Solution

The fourth proportional to 417.42, 626.20 and 143.50 is: 215.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.42 : 626.20 = 143.50 : x
  2. Step 2: Convert to fraction form
    417.42/626.20 = 143.50/x
  3. Step 3: Cross multiply
    417.42x = 626.20 × 143.50
  4. Step 4: Simplify right side
    417.42x = 89,859.70
  5. Step 5: Solve for x
    x = 89,859.70/417.42
  6. Step 6: Final answer
    x = 215.27

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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.