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Finding the Fourth Proportional to 21,851.91, 30,082.74 and 20,847.68

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Solution

The fourth proportional to 21,851.91, 30,082.74 and 20,847.68 is: 28,700.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,851.91 : 30,082.74 = 20,847.68 : x
  2. Step 2: Convert to fraction form
    21,851.91/30,082.74 = 20,847.68/x
  3. Step 3: Cross multiply
    21,851.91x = 30,082.74 × 20,847.68
  4. Step 4: Simplify right side
    21,851.91x = 627,155,337.04
  5. Step 5: Solve for x
    x = 627,155,337.04/21,851.91
  6. Step 6: Final answer
    x = 28,700.25

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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.