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Finding the Fourth Proportional to 2,619.10, 3,928.71 and 671.30

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Solution

The fourth proportional to 2,619.10, 3,928.71 and 671.30 is: 1,006.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.10 : 3,928.71 = 671.30 : x
  2. Step 2: Convert to fraction form
    2,619.10/3,928.71 = 671.30/x
  3. Step 3: Cross multiply
    2,619.10x = 3,928.71 × 671.30
  4. Step 4: Simplify right side
    2,619.10x = 2,637,343.02
  5. Step 5: Solve for x
    x = 2,637,343.02/2,619.10
  6. Step 6: Final answer
    x = 1,006.97

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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.