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Finding the Fourth Proportional to 1,420.22, 1,959.96 and 860.80

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Solution

The fourth proportional to 1,420.22, 1,959.96 and 860.80 is: 1,187.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.22 : 1,959.96 = 860.80 : x
  2. Step 2: Convert to fraction form
    1,420.22/1,959.96 = 860.80/x
  3. Step 3: Cross multiply
    1,420.22x = 1,959.96 × 860.80
  4. Step 4: Simplify right side
    1,420.22x = 1,687,133.57
  5. Step 5: Solve for x
    x = 1,687,133.57/1,420.22
  6. Step 6: Final answer
    x = 1,187.94

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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.