Home / 1,327.20-1,830.60-861.36

Finding the Fourth Proportional to 1,327.20, 1,830.60 and 861.36

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Solution

The fourth proportional to 1,327.20, 1,830.60 and 861.36 is: 1,188.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.20 : 1,830.60 = 861.36 : x
  2. Step 2: Convert to fraction form
    1,327.20/1,830.60 = 861.36/x
  3. Step 3: Cross multiply
    1,327.20x = 1,830.60 × 861.36
  4. Step 4: Simplify right side
    1,327.20x = 1,576,805.62
  5. Step 5: Solve for x
    x = 1,576,805.62/1,327.20
  6. Step 6: Final answer
    x = 1,188.07

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1.5x scale

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.