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Finding the Fourth Proportional to 708.14, 977.32 and 397.70

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Solution

The fourth proportional to 708.14, 977.32 and 397.70 is: 548.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.14 : 977.32 = 397.70 : x
  2. Step 2: Convert to fraction form
    708.14/977.32 = 397.70/x
  3. Step 3: Cross multiply
    708.14x = 977.32 × 397.70
  4. Step 4: Simplify right side
    708.14x = 388,674.28
  5. Step 5: Solve for x
    x = 388,674.28/708.14
  6. Step 6: Final answer
    x = 548.87

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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.