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Finding the Fourth Proportional to 20,130.78, 30,201.38 and 7,651.02

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Solution

The fourth proportional to 20,130.78, 30,201.38 and 7,651.02 is: 11,478.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.78 : 30,201.38 = 7,651.02 : x
  2. Step 2: Convert to fraction form
    20,130.78/30,201.38 = 7,651.02/x
  3. Step 3: Cross multiply
    20,130.78x = 30,201.38 × 7,651.02
  4. Step 4: Simplify right side
    20,130.78x = 231,071,362.41
  5. Step 5: Solve for x
    x = 231,071,362.41/20,130.78
  6. Step 6: Final answer
    x = 11,478.51

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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.