Home / 20,690.70-28,553.07-11,259.18

Finding the Fourth Proportional to 20,690.70, 28,553.07 and 11,259.18

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Solution

The fourth proportional to 20,690.70, 28,553.07 and 11,259.18 is: 15,537.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.70 : 28,553.07 = 11,259.18 : x
  2. Step 2: Convert to fraction form
    20,690.70/28,553.07 = 11,259.18/x
  3. Step 3: Cross multiply
    20,690.70x = 28,553.07 × 11,259.18
  4. Step 4: Simplify right side
    20,690.70x = 321,484,154.68
  5. Step 5: Solve for x
    x = 321,484,154.68/20,690.70
  6. Step 6: Final answer
    x = 15,537.62

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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.