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Finding the Fourth Proportional to 685.08, 1,027.22 and 319.95

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Solution

The fourth proportional to 685.08, 1,027.22 and 319.95 is: 479.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.08 : 1,027.22 = 319.95 : x
  2. Step 2: Convert to fraction form
    685.08/1,027.22 = 319.95/x
  3. Step 3: Cross multiply
    685.08x = 1,027.22 × 319.95
  4. Step 4: Simplify right side
    685.08x = 328,657.44
  5. Step 5: Solve for x
    x = 328,657.44/685.08
  6. Step 6: Final answer
    x = 479.74

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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.