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Finding the Fourth Proportional to 661.87, 991.44 and 613.27

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Solution

The fourth proportional to 661.87, 991.44 and 613.27 is: 918.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.87 : 991.44 = 613.27 : x
  2. Step 2: Convert to fraction form
    661.87/991.44 = 613.27/x
  3. Step 3: Cross multiply
    661.87x = 991.44 × 613.27
  4. Step 4: Simplify right side
    661.87x = 608,021.65
  5. Step 5: Solve for x
    x = 608,021.65/661.87
  6. Step 6: Final answer
    x = 918.64

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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.