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Finding the Fourth Proportional to 28,993.68, 39,973.20 and 20,920.56

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Solution

The fourth proportional to 28,993.68, 39,973.20 and 20,920.56 is: 28,842.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,993.68 : 39,973.20 = 20,920.56 : x
  2. Step 2: Convert to fraction form
    28,993.68/39,973.20 = 20,920.56/x
  3. Step 3: Cross multiply
    28,993.68x = 39,973.20 × 20,920.56
  4. Step 4: Simplify right side
    28,993.68x = 836,261,728.99
  5. Step 5: Solve for x
    x = 836,261,728.99/28,993.68
  6. Step 6: Final answer
    x = 28,842.90

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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.