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Finding the Fourth Proportional to 22,643.28, 31,231.08 and 13,211.28

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Solution

The fourth proportional to 22,643.28, 31,231.08 and 13,211.28 is: 18,221.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,643.28 : 31,231.08 = 13,211.28 : x
  2. Step 2: Convert to fraction form
    22,643.28/31,231.08 = 13,211.28/x
  3. Step 3: Cross multiply
    22,643.28x = 31,231.08 × 13,211.28
  4. Step 4: Simplify right side
    22,643.28x = 412,602,542.58
  5. Step 5: Solve for x
    x = 412,602,542.58/22,643.28
  6. Step 6: Final answer
    x = 18,221.85

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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.