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Finding the Fourth Proportional to 6,761.81, 9,330.58 and 3,928.64

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Solution

The fourth proportional to 6,761.81, 9,330.58 and 3,928.64 is: 5,421.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,761.81 : 9,330.58 = 3,928.64 : x
  2. Step 2: Convert to fraction form
    6,761.81/9,330.58 = 3,928.64/x
  3. Step 3: Cross multiply
    6,761.81x = 9,330.58 × 3,928.64
  4. Step 4: Simplify right side
    6,761.81x = 36,656,489.81
  5. Step 5: Solve for x
    x = 36,656,489.81/6,761.81
  6. Step 6: Final answer
    x = 5,421.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.