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Finding the Fourth Proportional to 20,135.28, 30,146.88 and 10,253.28

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Solution

The fourth proportional to 20,135.28, 30,146.88 and 10,253.28 is: 15,351.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,135.28 : 30,146.88 = 10,253.28 : x
  2. Step 2: Convert to fraction form
    20,135.28/30,146.88 = 10,253.28/x
  3. Step 3: Cross multiply
    20,135.28x = 30,146.88 × 10,253.28
  4. Step 4: Simplify right side
    20,135.28x = 309,104,401.77
  5. Step 5: Solve for x
    x = 309,104,401.77/20,135.28
  6. Step 6: Final answer
    x = 15,351.38

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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.