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Finding the Fourth Proportional to 20,770.16, 31,154.42 and 6,919.16

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Solution

The fourth proportional to 20,770.16, 31,154.42 and 6,919.16 is: 10,378.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,770.16 : 31,154.42 = 6,919.16 : x
  2. Step 2: Convert to fraction form
    20,770.16/31,154.42 = 6,919.16/x
  3. Step 3: Cross multiply
    20,770.16x = 31,154.42 × 6,919.16
  4. Step 4: Simplify right side
    20,770.16x = 215,562,278.21
  5. Step 5: Solve for x
    x = 215,562,278.21/20,770.16
  6. Step 6: Final answer
    x = 10,378.46

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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.