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Finding the Fourth Proportional to 275.40, 378.54 and 242.46

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Solution

The fourth proportional to 275.40, 378.54 and 242.46 is: 333.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.40 : 378.54 = 242.46 : x
  2. Step 2: Convert to fraction form
    275.40/378.54 = 242.46/x
  3. Step 3: Cross multiply
    275.40x = 378.54 × 242.46
  4. Step 4: Simplify right side
    275.40x = 91,780.81
  5. Step 5: Solve for x
    x = 91,780.81/275.40
  6. Step 6: Final answer
    x = 333.26

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.