Home / 20,289.11-28,009.46-13,990.55

Finding the Fourth Proportional to 20,289.11, 28,009.46 and 13,990.55

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Solution

The fourth proportional to 20,289.11, 28,009.46 and 13,990.55 is: 19,314.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,289.11 : 28,009.46 = 13,990.55 : x
  2. Step 2: Convert to fraction form
    20,289.11/28,009.46 = 13,990.55/x
  3. Step 3: Cross multiply
    20,289.11x = 28,009.46 × 13,990.55
  4. Step 4: Simplify right side
    20,289.11x = 391,867,645.53
  5. Step 5: Solve for x
    x = 391,867,645.53/20,289.11
  6. Step 6: Final answer
    x = 19,314.19

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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.