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Finding the Fourth Proportional to 660.79, 991.41 and 416.98

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Solution

The fourth proportional to 660.79, 991.41 and 416.98 is: 625.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.79 : 991.41 = 416.98 : x
  2. Step 2: Convert to fraction form
    660.79/991.41 = 416.98/x
  3. Step 3: Cross multiply
    660.79x = 991.41 × 416.98
  4. Step 4: Simplify right side
    660.79x = 413,398.14
  5. Step 5: Solve for x
    x = 413,398.14/660.79
  6. Step 6: Final answer
    x = 625.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.