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Finding the Fourth Proportional to 386.11, 532.33 and 315.91

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Solution

The fourth proportional to 386.11, 532.33 and 315.91 is: 435.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.11 : 532.33 = 315.91 : x
  2. Step 2: Convert to fraction form
    386.11/532.33 = 315.91/x
  3. Step 3: Cross multiply
    386.11x = 532.33 × 315.91
  4. Step 4: Simplify right side
    386.11x = 168,168.37
  5. Step 5: Solve for x
    x = 168,168.37/386.11
  6. Step 6: Final answer
    x = 435.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.