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Finding the Fourth Proportional to 708.09, 978.11 and 576.87

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Solution

The fourth proportional to 708.09, 978.11 and 576.87 is: 796.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.09 : 978.11 = 576.87 : x
  2. Step 2: Convert to fraction form
    708.09/978.11 = 576.87/x
  3. Step 3: Cross multiply
    708.09x = 978.11 × 576.87
  4. Step 4: Simplify right side
    708.09x = 564,242.32
  5. Step 5: Solve for x
    x = 564,242.32/708.09
  6. Step 6: Final answer
    x = 796.85

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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.