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Finding the Fourth Proportional to 3,246.64, 4,870.20 and 938

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Solution

The fourth proportional to 3,246.64, 4,870.20 and 938 is: 1,407.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,246.64 : 4,870.20 = 938 : x
  2. Step 2: Convert to fraction form
    3,246.64/4,870.20 = 938/x
  3. Step 3: Cross multiply
    3,246.64x = 4,870.20 × 938
  4. Step 4: Simplify right side
    3,246.64x = 4,568,247.60
  5. Step 5: Solve for x
    x = 4,568,247.60/3,246.64
  6. Step 6: Final answer
    x = 1,407.07

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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.