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Finding the Fourth Proportional to 261.72, 393.12 and 193.68

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Solution

The fourth proportional to 261.72, 393.12 and 193.68 is: 290.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.72 : 393.12 = 193.68 : x
  2. Step 2: Convert to fraction form
    261.72/393.12 = 193.68/x
  3. Step 3: Cross multiply
    261.72x = 393.12 × 193.68
  4. Step 4: Simplify right side
    261.72x = 76,139.48
  5. Step 5: Solve for x
    x = 76,139.48/261.72
  6. Step 6: Final answer
    x = 290.92

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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.