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Finding the Fourth Proportional to 417.75, 626.61 and 143.77

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Solution

The fourth proportional to 417.75, 626.61 and 143.77 is: 215.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.75 : 626.61 = 143.77 : x
  2. Step 2: Convert to fraction form
    417.75/626.61 = 143.77/x
  3. Step 3: Cross multiply
    417.75x = 626.61 × 143.77
  4. Step 4: Simplify right side
    417.75x = 90,087.72
  5. Step 5: Solve for x
    x = 90,087.72/417.75
  6. Step 6: Final answer
    x = 215.65

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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.