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Finding the Fourth Proportional to 242.44, 334.45 and 153.78

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Solution

The fourth proportional to 242.44, 334.45 and 153.78 is: 212.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.44 : 334.45 = 153.78 : x
  2. Step 2: Convert to fraction form
    242.44/334.45 = 153.78/x
  3. Step 3: Cross multiply
    242.44x = 334.45 × 153.78
  4. Step 4: Simplify right side
    242.44x = 51,429.28
  5. Step 5: Solve for x
    x = 51,429.28/242.44
  6. Step 6: Final answer
    x = 212.13

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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.