Home / 1,451.26-2,002.80-861.85

Finding the Fourth Proportional to 1,451.26, 2,002.80 and 861.85

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Solution

The fourth proportional to 1,451.26, 2,002.80 and 861.85 is: 1,189.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,451.26 : 2,002.80 = 861.85 : x
  2. Step 2: Convert to fraction form
    1,451.26/2,002.80 = 861.85/x
  3. Step 3: Cross multiply
    1,451.26x = 2,002.80 × 861.85
  4. Step 4: Simplify right side
    1,451.26x = 1,726,113.18
  5. Step 5: Solve for x
    x = 1,726,113.18/1,451.26
  6. Step 6: Final answer
    x = 1,189.39

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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.