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Finding the Fourth Proportional to 3,290.40, 4,933.80 and 1,340.40

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Solution

The fourth proportional to 3,290.40, 4,933.80 and 1,340.40 is: 2,009.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,290.40 : 4,933.80 = 1,340.40 : x
  2. Step 2: Convert to fraction form
    3,290.40/4,933.80 = 1,340.40/x
  3. Step 3: Cross multiply
    3,290.40x = 4,933.80 × 1,340.40
  4. Step 4: Simplify right side
    3,290.40x = 6,613,265.52
  5. Step 5: Solve for x
    x = 6,613,265.52/3,290.40
  6. Step 6: Final answer
    x = 2,009.87

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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.