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Finding the Fourth Proportional to 247.20, 340.80 and 236.40

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Solution

The fourth proportional to 247.20, 340.80 and 236.40 is: 325.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.20 : 340.80 = 236.40 : x
  2. Step 2: Convert to fraction form
    247.20/340.80 = 236.40/x
  3. Step 3: Cross multiply
    247.20x = 340.80 × 236.40
  4. Step 4: Simplify right side
    247.20x = 80,565.12
  5. Step 5: Solve for x
    x = 80,565.12/247.20
  6. Step 6: Final answer
    x = 325.91

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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.