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Finding the Fourth Proportional to 485.89, 670.89 and 449.02

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Solution

The fourth proportional to 485.89, 670.89 and 449.02 is: 619.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.89 : 670.89 = 449.02 : x
  2. Step 2: Convert to fraction form
    485.89/670.89 = 449.02/x
  3. Step 3: Cross multiply
    485.89x = 670.89 × 449.02
  4. Step 4: Simplify right side
    485.89x = 301,243.03
  5. Step 5: Solve for x
    x = 301,243.03/485.89
  6. Step 6: Final answer
    x = 619.98

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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.