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Finding the Fourth Proportional to 979.80, 1,469.70 and 708.45

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Solution

The fourth proportional to 979.80, 1,469.70 and 708.45 is: 1,062.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.80 : 1,469.70 = 708.45 : x
  2. Step 2: Convert to fraction form
    979.80/1,469.70 = 708.45/x
  3. Step 3: Cross multiply
    979.80x = 1,469.70 × 708.45
  4. Step 4: Simplify right side
    979.80x = 1,041,208.97
  5. Step 5: Solve for x
    x = 1,041,208.97/979.80
  6. Step 6: Final answer
    x = 1,062.68

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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.