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Finding the Fourth Proportional to 243.32, 336.18 and 215.72

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Solution

The fourth proportional to 243.32, 336.18 and 215.72 is: 298.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.32 : 336.18 = 215.72 : x
  2. Step 2: Convert to fraction form
    243.32/336.18 = 215.72/x
  3. Step 3: Cross multiply
    243.32x = 336.18 × 215.72
  4. Step 4: Simplify right side
    243.32x = 72,520.75
  5. Step 5: Solve for x
    x = 72,520.75/243.32
  6. Step 6: Final answer
    x = 298.05

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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.