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Finding the Fourth Proportional to 218.26, 325.87 and 187.70

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Solution

The fourth proportional to 218.26, 325.87 and 187.70 is: 280.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.26 : 325.87 = 187.70 : x
  2. Step 2: Convert to fraction form
    218.26/325.87 = 187.70/x
  3. Step 3: Cross multiply
    218.26x = 325.87 × 187.70
  4. Step 4: Simplify right side
    218.26x = 61,164.86
  5. Step 5: Solve for x
    x = 61,164.86/218.26
  6. Step 6: Final answer
    x = 280.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.