Home / 20,690.60-28,553.30-11,259.15

Finding the Fourth Proportional to 20,690.60, 28,553.30 and 11,259.15

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Solution

The fourth proportional to 20,690.60, 28,553.30 and 11,259.15 is: 15,537.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.60 : 28,553.30 = 11,259.15 : x
  2. Step 2: Convert to fraction form
    20,690.60/28,553.30 = 11,259.15/x
  3. Step 3: Cross multiply
    20,690.60x = 28,553.30 × 11,259.15
  4. Step 4: Simplify right side
    20,690.60x = 321,485,831.40
  5. Step 5: Solve for x
    x = 321,485,831.40/20,690.60
  6. Step 6: Final answer
    x = 15,537.78

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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.