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Finding the Fourth Proportional to 20,491.90, 30,737.85 and 20,200.30

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Solution

The fourth proportional to 20,491.90, 30,737.85 and 20,200.30 is: 30,300.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.90 : 30,737.85 = 20,200.30 : x
  2. Step 2: Convert to fraction form
    20,491.90/30,737.85 = 20,200.30/x
  3. Step 3: Cross multiply
    20,491.90x = 30,737.85 × 20,200.30
  4. Step 4: Simplify right side
    20,491.90x = 620,913,791.36
  5. Step 5: Solve for x
    x = 620,913,791.36/20,491.90
  6. Step 6: Final answer
    x = 30,300.45

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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.