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Finding the Fourth Proportional to 242.78, 364.24 and 215.90

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Solution

The fourth proportional to 242.78, 364.24 and 215.90 is: 323.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.78 : 364.24 = 215.90 : x
  2. Step 2: Convert to fraction form
    242.78/364.24 = 215.90/x
  3. Step 3: Cross multiply
    242.78x = 364.24 × 215.90
  4. Step 4: Simplify right side
    242.78x = 78,639.42
  5. Step 5: Solve for x
    x = 78,639.42/242.78
  6. Step 6: Final answer
    x = 323.91

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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.