Home / 1,122.18-1,683.29-391.77

Finding the Fourth Proportional to 1,122.18, 1,683.29 and 391.77

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Solution

The fourth proportional to 1,122.18, 1,683.29 and 391.77 is: 587.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.18 : 1,683.29 = 391.77 : x
  2. Step 2: Convert to fraction form
    1,122.18/1,683.29 = 391.77/x
  3. Step 3: Cross multiply
    1,122.18x = 1,683.29 × 391.77
  4. Step 4: Simplify right side
    1,122.18x = 659,462.52
  5. Step 5: Solve for x
    x = 659,462.52/1,122.18
  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.