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Finding the Fourth Proportional to 708.79, 978.14 and 428.97

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Solution

The fourth proportional to 708.79, 978.14 and 428.97 is: 591.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.79 : 978.14 = 428.97 : x
  2. Step 2: Convert to fraction form
    708.79/978.14 = 428.97/x
  3. Step 3: Cross multiply
    708.79x = 978.14 × 428.97
  4. Step 4: Simplify right side
    708.79x = 419,590.57
  5. Step 5: Solve for x
    x = 419,590.57/708.79
  6. Step 6: Final answer
    x = 591.98

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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.