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Finding the Fourth Proportional to 318.47, 476.78 and 196.35

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Solution

The fourth proportional to 318.47, 476.78 and 196.35 is: 293.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.47 : 476.78 = 196.35 : x
  2. Step 2: Convert to fraction form
    318.47/476.78 = 196.35/x
  3. Step 3: Cross multiply
    318.47x = 476.78 × 196.35
  4. Step 4: Simplify right side
    318.47x = 93,614.77
  5. Step 5: Solve for x
    x = 93,614.77/318.47
  6. Step 6: Final answer
    x = 293.96

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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.