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Finding the Fourth Proportional to 398.80, 597.72 and 311.92

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Solution

The fourth proportional to 398.80, 597.72 and 311.92 is: 467.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.80 : 597.72 = 311.92 : x
  2. Step 2: Convert to fraction form
    398.80/597.72 = 311.92/x
  3. Step 3: Cross multiply
    398.80x = 597.72 × 311.92
  4. Step 4: Simplify right side
    398.80x = 186,440.82
  5. Step 5: Solve for x
    x = 186,440.82/398.80
  6. Step 6: Final answer
    x = 467.50

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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.