Home / 28,028.28-38,681.76-20,942.40

Finding the Fourth Proportional to 28,028.28, 38,681.76 and 20,942.40

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Solution

The fourth proportional to 28,028.28, 38,681.76 and 20,942.40 is: 28,902.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,028.28 : 38,681.76 = 20,942.40 : x
  2. Step 2: Convert to fraction form
    28,028.28/38,681.76 = 20,942.40/x
  3. Step 3: Cross multiply
    28,028.28x = 38,681.76 × 20,942.40
  4. Step 4: Simplify right side
    28,028.28x = 810,088,890.62
  5. Step 5: Solve for x
    x = 810,088,890.62/28,028.28
  6. Step 6: Final answer
    x = 28,902.55

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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.