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Finding the Fourth Proportional to 702.52, 969.78 and 688.12

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Solution

The fourth proportional to 702.52, 969.78 and 688.12 is: 949.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.52 : 969.78 = 688.12 : x
  2. Step 2: Convert to fraction form
    702.52/969.78 = 688.12/x
  3. Step 3: Cross multiply
    702.52x = 969.78 × 688.12
  4. Step 4: Simplify right side
    702.52x = 667,325.01
  5. Step 5: Solve for x
    x = 667,325.01/702.52
  6. Step 6: Final answer
    x = 949.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.