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Finding the Fourth Proportional to 660.77, 991.08 and 416.55

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Solution

The fourth proportional to 660.77, 991.08 and 416.55 is: 624.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.77 : 991.08 = 416.55 : x
  2. Step 2: Convert to fraction form
    660.77/991.08 = 416.55/x
  3. Step 3: Cross multiply
    660.77x = 991.08 × 416.55
  4. Step 4: Simplify right side
    660.77x = 412,834.37
  5. Step 5: Solve for x
    x = 412,834.37/660.77
  6. Step 6: Final answer
    x = 624.78

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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.