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Finding the Fourth Proportional to 315.66, 472.29 and 191.80

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Solution

The fourth proportional to 315.66, 472.29 and 191.80 is: 286.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.66 : 472.29 = 191.80 : x
  2. Step 2: Convert to fraction form
    315.66/472.29 = 191.80/x
  3. Step 3: Cross multiply
    315.66x = 472.29 × 191.80
  4. Step 4: Simplify right side
    315.66x = 90,585.22
  5. Step 5: Solve for x
    x = 90,585.22/315.66
  6. Step 6: Final answer
    x = 286.97

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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.