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Finding the Fourth Proportional to 969.12, 1,337.92 and 708.80

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Solution

The fourth proportional to 969.12, 1,337.92 and 708.80 is: 978.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.12 : 1,337.92 = 708.80 : x
  2. Step 2: Convert to fraction form
    969.12/1,337.92 = 708.80/x
  3. Step 3: Cross multiply
    969.12x = 1,337.92 × 708.80
  4. Step 4: Simplify right side
    969.12x = 948,317.70
  5. Step 5: Solve for x
    x = 948,317.70/969.12
  6. Step 6: Final answer
    x = 978.53

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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.