Home / 1,119.15-1,677.29-861.39

Finding the Fourth Proportional to 1,119.15, 1,677.29 and 861.39

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Solution

The fourth proportional to 1,119.15, 1,677.29 and 861.39 is: 1,290.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.15 : 1,677.29 = 861.39 : x
  2. Step 2: Convert to fraction form
    1,119.15/1,677.29 = 861.39/x
  3. Step 3: Cross multiply
    1,119.15x = 1,677.29 × 861.39
  4. Step 4: Simplify right side
    1,119.15x = 1,444,796.53
  5. Step 5: Solve for x
    x = 1,444,796.53/1,119.15
  6. Step 6: Final answer
    x = 1,290.98

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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.