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Finding the Fourth Proportional to 708.88, 978.50 and 414.24

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Solution

The fourth proportional to 708.88, 978.50 and 414.24 is: 571.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.88 : 978.50 = 414.24 : x
  2. Step 2: Convert to fraction form
    708.88/978.50 = 414.24/x
  3. Step 3: Cross multiply
    708.88x = 978.50 × 414.24
  4. Step 4: Simplify right side
    708.88x = 405,333.84
  5. Step 5: Solve for x
    x = 405,333.84/708.88
  6. Step 6: Final answer
    x = 571.79

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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.