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Finding the Fourth Proportional to 661.55, 911.84 and 641.93

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Solution

The fourth proportional to 661.55, 911.84 and 641.93 is: 884.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.55 : 911.84 = 641.93 : x
  2. Step 2: Convert to fraction form
    661.55/911.84 = 641.93/x
  3. Step 3: Cross multiply
    661.55x = 911.84 × 641.93
  4. Step 4: Simplify right side
    661.55x = 585,329.68
  5. Step 5: Solve for x
    x = 585,329.68/661.55
  6. Step 6: Final answer
    x = 884.79

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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.