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Finding the Fourth Proportional to 886, 1,222.71 and 487.64

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Solution

The fourth proportional to 886, 1,222.71 and 487.64 is: 672.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    886 : 1,222.71 = 487.64 : x
  2. Step 2: Convert to fraction form
    886/1,222.71 = 487.64/x
  3. Step 3: Cross multiply
    886x = 1,222.71 × 487.64
  4. Step 4: Simplify right side
    886x = 596,239.87
  5. Step 5: Solve for x
    x = 596,239.87/886
  6. Step 6: Final answer
    x = 672.96

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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.