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Finding the Fourth Proportional to 20,274.99, 30,428.15 and 10,422.87

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Solution

The fourth proportional to 20,274.99, 30,428.15 and 10,422.87 is: 15,642.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,274.99 : 30,428.15 = 10,422.87 : x
  2. Step 2: Convert to fraction form
    20,274.99/30,428.15 = 10,422.87/x
  3. Step 3: Cross multiply
    20,274.99x = 30,428.15 × 10,422.87
  4. Step 4: Simplify right side
    20,274.99x = 317,148,651.79
  5. Step 5: Solve for x
    x = 317,148,651.79/20,274.99
  6. Step 6: Final answer
    x = 15,642.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.