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Finding the Fourth Proportional to 417.69, 626.70 and 186.78

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Solution

The fourth proportional to 417.69, 626.70 and 186.78 is: 280.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.69 : 626.70 = 186.78 : x
  2. Step 2: Convert to fraction form
    417.69/626.70 = 186.78/x
  3. Step 3: Cross multiply
    417.69x = 626.70 × 186.78
  4. Step 4: Simplify right side
    417.69x = 117,055.03
  5. Step 5: Solve for x
    x = 117,055.03/417.69
  6. Step 6: Final answer
    x = 280.24

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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.