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Finding the Fourth Proportional to 20,287.86, 30,418.02 and 7,138.50

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Solution

The fourth proportional to 20,287.86, 30,418.02 and 7,138.50 is: 10,702.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,287.86 : 30,418.02 = 7,138.50 : x
  2. Step 2: Convert to fraction form
    20,287.86/30,418.02 = 7,138.50/x
  3. Step 3: Cross multiply
    20,287.86x = 30,418.02 × 7,138.50
  4. Step 4: Simplify right side
    20,287.86x = 217,139,035.77
  5. Step 5: Solve for x
    x = 217,139,035.77/20,287.86
  6. Step 6: Final answer
    x = 10,702.90

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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.