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Finding the Fourth Proportional to 1,323.80, 1,984.26 and 861.90

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Solution

The fourth proportional to 1,323.80, 1,984.26 and 861.90 is: 1,291.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.80 : 1,984.26 = 861.90 : x
  2. Step 2: Convert to fraction form
    1,323.80/1,984.26 = 861.90/x
  3. Step 3: Cross multiply
    1,323.80x = 1,984.26 × 861.90
  4. Step 4: Simplify right side
    1,323.80x = 1,710,233.69
  5. Step 5: Solve for x
    x = 1,710,233.69/1,323.80
  6. Step 6: Final answer
    x = 1,291.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.