Home / 1,316.21-1,974.11-391.59

Finding the Fourth Proportional to 1,316.21, 1,974.11 and 391.59

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Solution

The fourth proportional to 1,316.21, 1,974.11 and 391.59 is: 587.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.21 : 1,974.11 = 391.59 : x
  2. Step 2: Convert to fraction form
    1,316.21/1,974.11 = 391.59/x
  3. Step 3: Cross multiply
    1,316.21x = 1,974.11 × 391.59
  4. Step 4: Simplify right side
    1,316.21x = 773,039.78
  5. Step 5: Solve for x
    x = 773,039.78/1,316.21
  6. Step 6: Final answer
    x = 587.32

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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.