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Finding the Fourth Proportional to 702.71, 1,054.07 and 685.79

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Solution

The fourth proportional to 702.71, 1,054.07 and 685.79 is: 1,028.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.71 : 1,054.07 = 685.79 : x
  2. Step 2: Convert to fraction form
    702.71/1,054.07 = 685.79/x
  3. Step 3: Cross multiply
    702.71x = 1,054.07 × 685.79
  4. Step 4: Simplify right side
    702.71x = 722,861.97
  5. Step 5: Solve for x
    x = 722,861.97/702.71
  6. Step 6: Final answer
    x = 1,028.68

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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.