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Finding the Fourth Proportional to 484.29, 726.42 and 191.78

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Solution

The fourth proportional to 484.29, 726.42 and 191.78 is: 287.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.29 : 726.42 = 191.78 : x
  2. Step 2: Convert to fraction form
    484.29/726.42 = 191.78/x
  3. Step 3: Cross multiply
    484.29x = 726.42 × 191.78
  4. Step 4: Simplify right side
    484.29x = 139,312.58
  5. Step 5: Solve for x
    x = 139,312.58/484.29
  6. Step 6: Final answer
    x = 287.66

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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.