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Finding the Fourth Proportional to 734.30, 1,101.45 and 685.70

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Solution

The fourth proportional to 734.30, 1,101.45 and 685.70 is: 1,028.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.30 : 1,101.45 = 685.70 : x
  2. Step 2: Convert to fraction form
    734.30/1,101.45 = 685.70/x
  3. Step 3: Cross multiply
    734.30x = 1,101.45 × 685.70
  4. Step 4: Simplify right side
    734.30x = 755,264.27
  5. Step 5: Solve for x
    x = 755,264.27/734.30
  6. Step 6: Final answer
    x = 1,028.55

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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.