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Finding the Fourth Proportional to 398.19, 596.88 and 215.76

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Solution

The fourth proportional to 398.19, 596.88 and 215.76 is: 323.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.19 : 596.88 = 215.76 : x
  2. Step 2: Convert to fraction form
    398.19/596.88 = 215.76/x
  3. Step 3: Cross multiply
    398.19x = 596.88 × 215.76
  4. Step 4: Simplify right side
    398.19x = 128,782.83
  5. Step 5: Solve for x
    x = 128,782.83/398.19
  6. Step 6: Final answer
    x = 323.42

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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.