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Finding the Fourth Proportional to 288.38, 398.23 and 210.15

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Solution

The fourth proportional to 288.38, 398.23 and 210.15 is: 290.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.38 : 398.23 = 210.15 : x
  2. Step 2: Convert to fraction form
    288.38/398.23 = 210.15/x
  3. Step 3: Cross multiply
    288.38x = 398.23 × 210.15
  4. Step 4: Simplify right side
    288.38x = 83,687.54
  5. Step 5: Solve for x
    x = 83,687.54/288.38
  6. Step 6: Final answer
    x = 290.20

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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.