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Finding the Fourth Proportional to 801.75, 1,200.59 and 678.74

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Solution

The fourth proportional to 801.75, 1,200.59 and 678.74 is: 1,016.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.75 : 1,200.59 = 678.74 : x
  2. Step 2: Convert to fraction form
    801.75/1,200.59 = 678.74/x
  3. Step 3: Cross multiply
    801.75x = 1,200.59 × 678.74
  4. Step 4: Simplify right side
    801.75x = 814,881.61
  5. Step 5: Solve for x
    x = 814,881.61/801.75
  6. Step 6: Final answer
    x = 1,016.37

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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.