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Finding the Fourth Proportional to 261.63, 393.17 and 146.25

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Solution

The fourth proportional to 261.63, 393.17 and 146.25 is: 219.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.63 : 393.17 = 146.25 : x
  2. Step 2: Convert to fraction form
    261.63/393.17 = 146.25/x
  3. Step 3: Cross multiply
    261.63x = 393.17 × 146.25
  4. Step 4: Simplify right side
    261.63x = 57,500.38
  5. Step 5: Solve for x
    x = 57,500.38/261.63
  6. Step 6: Final answer
    x = 219.78

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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.