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Finding the Fourth Proportional to 417.78, 626.55 and 125.23

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Solution

The fourth proportional to 417.78, 626.55 and 125.23 is: 187.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.78 : 626.55 = 125.23 : x
  2. Step 2: Convert to fraction form
    417.78/626.55 = 125.23/x
  3. Step 3: Cross multiply
    417.78x = 626.55 × 125.23
  4. Step 4: Simplify right side
    417.78x = 78,462.86
  5. Step 5: Solve for x
    x = 78,462.86/417.78
  6. Step 6: Final answer
    x = 187.81

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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.