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Finding the Fourth Proportional to 417.81, 626.71 and 143.90

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Solution

The fourth proportional to 417.81, 626.71 and 143.90 is: 215.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.81 : 626.71 = 143.90 : x
  2. Step 2: Convert to fraction form
    417.81/626.71 = 143.90/x
  3. Step 3: Cross multiply
    417.81x = 626.71 × 143.90
  4. Step 4: Simplify right side
    417.81x = 90,180.62
  5. Step 5: Solve for x
    x = 90,180.62/417.81
  6. Step 6: Final answer
    x = 215.84

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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.