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Finding the Fourth Proportional to 485.20, 727.88 and 192.76

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Solution

The fourth proportional to 485.20, 727.88 and 192.76 is: 289.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.20 : 727.88 = 192.76 : x
  2. Step 2: Convert to fraction form
    485.20/727.88 = 192.76/x
  3. Step 3: Cross multiply
    485.20x = 727.88 × 192.76
  4. Step 4: Simplify right side
    485.20x = 140,306.15
  5. Step 5: Solve for x
    x = 140,306.15/485.20
  6. Step 6: Final answer
    x = 289.17

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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.