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Finding the Fourth Proportional to 20,433.60, 30,621.60 and 15,127.20

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Solution

The fourth proportional to 20,433.60, 30,621.60 and 15,127.20 is: 22,669.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,433.60 : 30,621.60 = 15,127.20 : x
  2. Step 2: Convert to fraction form
    20,433.60/30,621.60 = 15,127.20/x
  3. Step 3: Cross multiply
    20,433.60x = 30,621.60 × 15,127.20
  4. Step 4: Simplify right side
    20,433.60x = 463,219,067.52
  5. Step 5: Solve for x
    x = 463,219,067.52/20,433.60
  6. Step 6: Final answer
    x = 22,669.48

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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.