Home / 1,421.23-1,961.34-861.80

Finding the Fourth Proportional to 1,421.23, 1,961.34 and 861.80

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Solution

The fourth proportional to 1,421.23, 1,961.34 and 861.80 is: 1,189.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.23 : 1,961.34 = 861.80 : x
  2. Step 2: Convert to fraction form
    1,421.23/1,961.34 = 861.80/x
  3. Step 3: Cross multiply
    1,421.23x = 1,961.34 × 861.80
  4. Step 4: Simplify right side
    1,421.23x = 1,690,282.81
  5. Step 5: Solve for x
    x = 1,690,282.81/1,421.23
  6. Step 6: Final answer
    x = 1,189.31

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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.