Home / 12,221.18-16,868.57-11,390.12

Finding the Fourth Proportional to 12,221.18, 16,868.57 and 11,390.12

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Solution

The fourth proportional to 12,221.18, 16,868.57 and 11,390.12 is: 15,721.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,221.18 : 16,868.57 = 11,390.12 : x
  2. Step 2: Convert to fraction form
    12,221.18/16,868.57 = 11,390.12/x
  3. Step 3: Cross multiply
    12,221.18x = 16,868.57 × 11,390.12
  4. Step 4: Simplify right side
    12,221.18x = 192,134,895.23
  5. Step 5: Solve for x
    x = 192,134,895.23/12,221.18
  6. Step 6: Final answer
    x = 15,721.47

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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.