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Finding the Fourth Proportional to 21,898.50, 30,277.53 and 20,919.30

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Solution

The fourth proportional to 21,898.50, 30,277.53 and 20,919.30 is: 28,923.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,898.50 : 30,277.53 = 20,919.30 : x
  2. Step 2: Convert to fraction form
    21,898.50/30,277.53 = 20,919.30/x
  3. Step 3: Cross multiply
    21,898.50x = 30,277.53 × 20,919.30
  4. Step 4: Simplify right side
    21,898.50x = 633,384,733.33
  5. Step 5: Solve for x
    x = 633,384,733.33/21,898.50
  6. Step 6: Final answer
    x = 28,923.66

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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.