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Finding the Fourth Proportional to 2,620.68, 3,931.05 and 672.90

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Solution

The fourth proportional to 2,620.68, 3,931.05 and 672.90 is: 1,009.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.68 : 3,931.05 = 672.90 : x
  2. Step 2: Convert to fraction form
    2,620.68/3,931.05 = 672.90/x
  3. Step 3: Cross multiply
    2,620.68x = 3,931.05 × 672.90
  4. Step 4: Simplify right side
    2,620.68x = 2,645,203.55
  5. Step 5: Solve for x
    x = 2,645,203.55/2,620.68
  6. Step 6: Final answer
    x = 1,009.36

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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.