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Finding the Fourth Proportional to 708.74, 978 and 394

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Solution

The fourth proportional to 708.74, 978 and 394 is: 543.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.74 : 978 = 394 : x
  2. Step 2: Convert to fraction form
    708.74/978 = 394/x
  3. Step 3: Cross multiply
    708.74x = 978 × 394
  4. Step 4: Simplify right side
    708.74x = 385,332
  5. Step 5: Solve for x
    x = 385,332/708.74
  6. Step 6: Final answer
    x = 543.69

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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.