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Finding the Fourth Proportional to 20,570.97, 30,850.07 and 7,421.63

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Solution

The fourth proportional to 20,570.97, 30,850.07 and 7,421.63 is: 11,130.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.97 : 30,850.07 = 7,421.63 : x
  2. Step 2: Convert to fraction form
    20,570.97/30,850.07 = 7,421.63/x
  3. Step 3: Cross multiply
    20,570.97x = 30,850.07 × 7,421.63
  4. Step 4: Simplify right side
    20,570.97x = 228,957,805.01
  5. Step 5: Solve for x
    x = 228,957,805.01/20,570.97
  6. Step 6: Final answer
    x = 11,130.14

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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.