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Finding the Fourth Proportional to 708.80, 979.06 and 487.36

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Solution

The fourth proportional to 708.80, 979.06 and 487.36 is: 673.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.80 : 979.06 = 487.36 : x
  2. Step 2: Convert to fraction form
    708.80/979.06 = 487.36/x
  3. Step 3: Cross multiply
    708.80x = 979.06 × 487.36
  4. Step 4: Simplify right side
    708.80x = 477,151.02
  5. Step 5: Solve for x
    x = 477,151.02/708.80
  6. Step 6: Final answer
    x = 673.19

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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.