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Finding the Fourth Proportional to 398.48, 597.02 and 215.78

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Solution

The fourth proportional to 398.48, 597.02 and 215.78 is: 323.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.48 : 597.02 = 215.78 : x
  2. Step 2: Convert to fraction form
    398.48/597.02 = 215.78/x
  3. Step 3: Cross multiply
    398.48x = 597.02 × 215.78
  4. Step 4: Simplify right side
    398.48x = 128,820.91
  5. Step 5: Solve for x
    x = 128,820.91/398.48
  6. Step 6: Final answer
    x = 323.28

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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.