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Finding the Fourth Proportional to 884.69, 1,221.17 and 687.86

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Solution

The fourth proportional to 884.69, 1,221.17 and 687.86 is: 949.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.69 : 1,221.17 = 687.86 : x
  2. Step 2: Convert to fraction form
    884.69/1,221.17 = 687.86/x
  3. Step 3: Cross multiply
    884.69x = 1,221.17 × 687.86
  4. Step 4: Simplify right side
    884.69x = 839,994.00
  5. Step 5: Solve for x
    x = 839,994.00/884.69
  6. Step 6: Final answer
    x = 949.48

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Double scale
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1.5x scale

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.