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Finding the Fourth Proportional to 486.55, 728.12 and 398.83

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Solution

The fourth proportional to 486.55, 728.12 and 398.83 is: 596.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.55 : 728.12 = 398.83 : x
  2. Step 2: Convert to fraction form
    486.55/728.12 = 398.83/x
  3. Step 3: Cross multiply
    486.55x = 728.12 × 398.83
  4. Step 4: Simplify right side
    486.55x = 290,394.11
  5. Step 5: Solve for x
    x = 290,394.11/486.55
  6. Step 6: Final answer
    x = 596.84

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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.