Home / 20,919.13-28,868.60-11,487.89

Finding the Fourth Proportional to 20,919.13, 28,868.60 and 11,487.89

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Solution

The fourth proportional to 20,919.13, 28,868.60 and 11,487.89 is: 15,853.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.13 : 28,868.60 = 11,487.89 : x
  2. Step 2: Convert to fraction form
    20,919.13/28,868.60 = 11,487.89/x
  3. Step 3: Cross multiply
    20,919.13x = 28,868.60 × 11,487.89
  4. Step 4: Simplify right side
    20,919.13x = 331,639,243.81
  5. Step 5: Solve for x
    x = 331,639,243.81/20,919.13
  6. Step 6: Final answer
    x = 15,853.40

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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.