Home / 1,316.25-1,974.38-391.77

Finding the Fourth Proportional to 1,316.25, 1,974.38 and 391.77

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Solution

The fourth proportional to 1,316.25, 1,974.38 and 391.77 is: 587.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.25 : 1,974.38 = 391.77 : x
  2. Step 2: Convert to fraction form
    1,316.25/1,974.38 = 391.77/x
  3. Step 3: Cross multiply
    1,316.25x = 1,974.38 × 391.77
  4. Step 4: Simplify right side
    1,316.25x = 773,500.89
  5. Step 5: Solve for x
    x = 773,500.89/1,316.25
  6. Step 6: Final answer
    x = 587.66

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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.