Home / 20,207.16-27,890.40-13,121.28

Finding the Fourth Proportional to 20,207.16, 27,890.40 and 13,121.28

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Solution

The fourth proportional to 20,207.16, 27,890.40 and 13,121.28 is: 18,110.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,207.16 : 27,890.40 = 13,121.28 : x
  2. Step 2: Convert to fraction form
    20,207.16/27,890.40 = 13,121.28/x
  3. Step 3: Cross multiply
    20,207.16x = 27,890.40 × 13,121.28
  4. Step 4: Simplify right side
    20,207.16x = 365,957,747.71
  5. Step 5: Solve for x
    x = 365,957,747.71/20,207.16
  6. Step 6: Final answer
    x = 18,110.30

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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.