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Finding the Fourth Proportional to 685.11, 1,026.35 and 423.89

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Solution

The fourth proportional to 685.11, 1,026.35 and 423.89 is: 635.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.11 : 1,026.35 = 423.89 : x
  2. Step 2: Convert to fraction form
    685.11/1,026.35 = 423.89/x
  3. Step 3: Cross multiply
    685.11x = 1,026.35 × 423.89
  4. Step 4: Simplify right side
    685.11x = 435,059.50
  5. Step 5: Solve for x
    x = 435,059.50/685.11
  6. Step 6: Final answer
    x = 635.02

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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.