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Finding the Fourth Proportional to 685.50, 1,027.99 and 425.10

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Solution

The fourth proportional to 685.50, 1,027.99 and 425.10 is: 637.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.50 : 1,027.99 = 425.10 : x
  2. Step 2: Convert to fraction form
    685.50/1,027.99 = 425.10/x
  3. Step 3: Cross multiply
    685.50x = 1,027.99 × 425.10
  4. Step 4: Simplify right side
    685.50x = 436,998.55
  5. Step 5: Solve for x
    x = 436,998.55/685.50
  6. Step 6: Final answer
    x = 637.49

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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.