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Finding the Fourth Proportional to 886.12, 1,318.73 and 860.20

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Solution

The fourth proportional to 886.12, 1,318.73 and 860.20 is: 1,280.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.12 : 1,318.73 = 860.20 : x
  2. Step 2: Convert to fraction form
    886.12/1,318.73 = 860.20/x
  3. Step 3: Cross multiply
    886.12x = 1,318.73 × 860.20
  4. Step 4: Simplify right side
    886.12x = 1,134,371.55
  5. Step 5: Solve for x
    x = 1,134,371.55/886.12
  6. Step 6: Final answer
    x = 1,280.16

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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.