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Finding the Fourth Proportional to 386.16, 532.20 and 287.88

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Solution

The fourth proportional to 386.16, 532.20 and 287.88 is: 396.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.16 : 532.20 = 287.88 : x
  2. Step 2: Convert to fraction form
    386.16/532.20 = 287.88/x
  3. Step 3: Cross multiply
    386.16x = 532.20 × 287.88
  4. Step 4: Simplify right side
    386.16x = 153,209.74
  5. Step 5: Solve for x
    x = 153,209.74/386.16
  6. Step 6: Final answer
    x = 396.75

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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.