Home / 6,920.10-10,380.15-1,989.81

Finding the Fourth Proportional to 6,920.10, 10,380.15 and 1,989.81

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Solution

The fourth proportional to 6,920.10, 10,380.15 and 1,989.81 is: 2,984.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,920.10 : 10,380.15 = 1,989.81 : x
  2. Step 2: Convert to fraction form
    6,920.10/10,380.15 = 1,989.81/x
  3. Step 3: Cross multiply
    6,920.10x = 10,380.15 × 1,989.81
  4. Step 4: Simplify right side
    6,920.10x = 20,654,526.27
  5. Step 5: Solve for x
    x = 20,654,526.27/6,920.10
  6. Step 6: Final answer
    x = 2,984.72

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Double scale
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Similar ratio
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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.