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Finding the Fourth Proportional to 485.85, 729.63 and 447.24

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Solution

The fourth proportional to 485.85, 729.63 and 447.24 is: 671.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.85 : 729.63 = 447.24 : x
  2. Step 2: Convert to fraction form
    485.85/729.63 = 447.24/x
  3. Step 3: Cross multiply
    485.85x = 729.63 × 447.24
  4. Step 4: Simplify right side
    485.85x = 326,319.72
  5. Step 5: Solve for x
    x = 326,319.72/485.85
  6. Step 6: Final answer
    x = 671.65

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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.