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Finding the Fourth Proportional to 20,139.10, 30,208.65 and 20,139.10

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Solution

The fourth proportional to 20,139.10, 30,208.65 and 20,139.10 is: 30,208.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.10 : 30,208.65 = 20,139.10 : x
  2. Step 2: Convert to fraction form
    20,139.10/30,208.65 = 20,139.10/x
  3. Step 3: Cross multiply
    20,139.10x = 30,208.65 × 20,139.10
  4. Step 4: Simplify right side
    20,139.10x = 608,375,023.22
  5. Step 5: Solve for x
    x = 608,375,023.22/20,139.10
  6. Step 6: Final answer
    x = 30,208.65

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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.