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Finding the Fourth Proportional to 20,392.61, 30,570.21 and 7,921.04

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Solution

The fourth proportional to 20,392.61, 30,570.21 and 7,921.04 is: 11,874.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,392.61 : 30,570.21 = 7,921.04 : x
  2. Step 2: Convert to fraction form
    20,392.61/30,570.21 = 7,921.04/x
  3. Step 3: Cross multiply
    20,392.61x = 30,570.21 × 7,921.04
  4. Step 4: Simplify right side
    20,392.61x = 242,147,703.37
  5. Step 5: Solve for x
    x = 242,147,703.37/20,392.61
  6. Step 6: Final answer
    x = 11,874.29

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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.