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Finding the Fourth Proportional to 418.40, 627.52 and 187.20

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Solution

The fourth proportional to 418.40, 627.52 and 187.20 is: 280.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.40 : 627.52 = 187.20 : x
  2. Step 2: Convert to fraction form
    418.40/627.52 = 187.20/x
  3. Step 3: Cross multiply
    418.40x = 627.52 × 187.20
  4. Step 4: Simplify right side
    418.40x = 117,471.74
  5. Step 5: Solve for x
    x = 117,471.74/418.40
  6. Step 6: Final answer
    x = 280.76

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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.