Home / 20,659.40-30,989.10-11,911.40

Finding the Fourth Proportional to 20,659.40, 30,989.10 and 11,911.40

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Solution

The fourth proportional to 20,659.40, 30,989.10 and 11,911.40 is: 17,867.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,659.40 : 30,989.10 = 11,911.40 : x
  2. Step 2: Convert to fraction form
    20,659.40/30,989.10 = 11,911.40/x
  3. Step 3: Cross multiply
    20,659.40x = 30,989.10 × 11,911.40
  4. Step 4: Simplify right side
    20,659.40x = 369,123,565.74
  5. Step 5: Solve for x
    x = 369,123,565.74/20,659.40
  6. Step 6: Final answer
    x = 17,867.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.