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Finding the Fourth Proportional to 449.30, 619.85 and 316.55

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Solution

The fourth proportional to 449.30, 619.85 and 316.55 is: 436.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.30 : 619.85 = 316.55 : x
  2. Step 2: Convert to fraction form
    449.30/619.85 = 316.55/x
  3. Step 3: Cross multiply
    449.30x = 619.85 × 316.55
  4. Step 4: Simplify right side
    449.30x = 196,215.86
  5. Step 5: Solve for x
    x = 196,215.86/449.30
  6. Step 6: Final answer
    x = 436.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.