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Finding the Fourth Proportional to 242.28, 361.44 and 215.28

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Solution

The fourth proportional to 242.28, 361.44 and 215.28 is: 321.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.28 : 361.44 = 215.28 : x
  2. Step 2: Convert to fraction form
    242.28/361.44 = 215.28/x
  3. Step 3: Cross multiply
    242.28x = 361.44 × 215.28
  4. Step 4: Simplify right side
    242.28x = 77,810.80
  5. Step 5: Solve for x
    x = 77,810.80/242.28
  6. Step 6: Final answer
    x = 321.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.