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Finding the Fourth Proportional to 876.28, 1,201.42 and 860.68

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Solution

The fourth proportional to 876.28, 1,201.42 and 860.68 is: 1,180.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.28 : 1,201.42 = 860.68 : x
  2. Step 2: Convert to fraction form
    876.28/1,201.42 = 860.68/x
  3. Step 3: Cross multiply
    876.28x = 1,201.42 × 860.68
  4. Step 4: Simplify right side
    876.28x = 1,034,038.17
  5. Step 5: Solve for x
    x = 1,034,038.17/876.28
  6. Step 6: Final answer
    x = 1,180.03

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.