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Finding the Fourth Proportional to 485.74, 729.50 and 254.79

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Solution

The fourth proportional to 485.74, 729.50 and 254.79 is: 382.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.74 : 729.50 = 254.79 : x
  2. Step 2: Convert to fraction form
    485.74/729.50 = 254.79/x
  3. Step 3: Cross multiply
    485.74x = 729.50 × 254.79
  4. Step 4: Simplify right side
    485.74x = 185,869.31
  5. Step 5: Solve for x
    x = 185,869.31/485.74
  6. Step 6: Final answer
    x = 382.65

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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.