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Finding the Fourth Proportional to 288.72, 398.19 and 242.55

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Solution

The fourth proportional to 288.72, 398.19 and 242.55 is: 334.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.72 : 398.19 = 242.55 : x
  2. Step 2: Convert to fraction form
    288.72/398.19 = 242.55/x
  3. Step 3: Cross multiply
    288.72x = 398.19 × 242.55
  4. Step 4: Simplify right side
    288.72x = 96,580.98
  5. Step 5: Solve for x
    x = 96,580.98/288.72
  6. Step 6: Final answer
    x = 334.51

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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.