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Finding the Fourth Proportional to 20,402.60, 30,603.90 and 10,012.20

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Solution

The fourth proportional to 20,402.60, 30,603.90 and 10,012.20 is: 15,018.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,402.60 : 30,603.90 = 10,012.20 : x
  2. Step 2: Convert to fraction form
    20,402.60/30,603.90 = 10,012.20/x
  3. Step 3: Cross multiply
    20,402.60x = 30,603.90 × 10,012.20
  4. Step 4: Simplify right side
    20,402.60x = 306,412,367.58
  5. Step 5: Solve for x
    x = 306,412,367.58/20,402.60
  6. Step 6: Final answer
    x = 15,018.30

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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.