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Finding the Fourth Proportional to 303.60, 418.80 and 187.12

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Solution

The fourth proportional to 303.60, 418.80 and 187.12 is: 258.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.60 : 418.80 = 187.12 : x
  2. Step 2: Convert to fraction form
    303.60/418.80 = 187.12/x
  3. Step 3: Cross multiply
    303.60x = 418.80 × 187.12
  4. Step 4: Simplify right side
    303.60x = 78,365.86
  5. Step 5: Solve for x
    x = 78,365.86/303.60
  6. Step 6: Final answer
    x = 258.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.