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Finding the Fourth Proportional to 485.17, 669.36 and 319.47

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Solution

The fourth proportional to 485.17, 669.36 and 319.47 is: 440.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.17 : 669.36 = 319.47 : x
  2. Step 2: Convert to fraction form
    485.17/669.36 = 319.47/x
  3. Step 3: Cross multiply
    485.17x = 669.36 × 319.47
  4. Step 4: Simplify right side
    485.17x = 213,840.44
  5. Step 5: Solve for x
    x = 213,840.44/485.17
  6. Step 6: Final answer
    x = 440.75

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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.