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Finding the Fourth Proportional to 417.29, 626.05 and 143.40

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Solution

The fourth proportional to 417.29, 626.05 and 143.40 is: 215.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.29 : 626.05 = 143.40 : x
  2. Step 2: Convert to fraction form
    417.29/626.05 = 143.40/x
  3. Step 3: Cross multiply
    417.29x = 626.05 × 143.40
  4. Step 4: Simplify right side
    417.29x = 89,775.57
  5. Step 5: Solve for x
    x = 89,775.57/417.29
  6. Step 6: Final answer
    x = 215.14

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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.