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Finding the Fourth Proportional to 685.01, 1,025.48 and 679.55

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Solution

The fourth proportional to 685.01, 1,025.48 and 679.55 is: 1,017.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.01 : 1,025.48 = 679.55 : x
  2. Step 2: Convert to fraction form
    685.01/1,025.48 = 679.55/x
  3. Step 3: Cross multiply
    685.01x = 1,025.48 × 679.55
  4. Step 4: Simplify right side
    685.01x = 696,856.41
  5. Step 5: Solve for x
    x = 696,856.41/685.01
  6. Step 6: Final answer
    x = 1,017.30

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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.