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Finding the Fourth Proportional to 886.76, 1,321.68 and 860.28

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Solution

The fourth proportional to 886.76, 1,321.68 and 860.28 is: 1,282.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.76 : 1,321.68 = 860.28 : x
  2. Step 2: Convert to fraction form
    886.76/1,321.68 = 860.28/x
  3. Step 3: Cross multiply
    886.76x = 1,321.68 × 860.28
  4. Step 4: Simplify right side
    886.76x = 1,137,014.87
  5. Step 5: Solve for x
    x = 1,137,014.87/886.76
  6. Step 6: Final answer
    x = 1,282.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.