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Finding the Fourth Proportional to 859.76, 1,287.96 and 425.60

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Solution

The fourth proportional to 859.76, 1,287.96 and 425.60 is: 637.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.76 : 1,287.96 = 425.60 : x
  2. Step 2: Convert to fraction form
    859.76/1,287.96 = 425.60/x
  3. Step 3: Cross multiply
    859.76x = 1,287.96 × 425.60
  4. Step 4: Simplify right side
    859.76x = 548,155.78
  5. Step 5: Solve for x
    x = 548,155.78/859.76
  6. Step 6: Final answer
    x = 637.57

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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.