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Finding the Fourth Proportional to 2,619.40, 3,929.12 and 671.76

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Solution

The fourth proportional to 2,619.40, 3,929.12 and 671.76 is: 1,007.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.40 : 3,929.12 = 671.76 : x
  2. Step 2: Convert to fraction form
    2,619.40/3,929.12 = 671.76/x
  3. Step 3: Cross multiply
    2,619.40x = 3,929.12 × 671.76
  4. Step 4: Simplify right side
    2,619.40x = 2,639,425.65
  5. Step 5: Solve for x
    x = 2,639,425.65/2,619.40
  6. Step 6: Final answer
    x = 1,007.65

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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.