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Finding the Fourth Proportional to 20,756.80, 31,135.20 and 6,905.80

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Solution

The fourth proportional to 20,756.80, 31,135.20 and 6,905.80 is: 10,358.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,756.80 : 31,135.20 = 6,905.80 : x
  2. Step 2: Convert to fraction form
    20,756.80/31,135.20 = 6,905.80/x
  3. Step 3: Cross multiply
    20,756.80x = 31,135.20 × 6,905.80
  4. Step 4: Simplify right side
    20,756.80x = 215,013,464.16
  5. Step 5: Solve for x
    x = 215,013,464.16/20,756.80
  6. Step 6: Final answer
    x = 10,358.70

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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.