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Finding the Fourth Proportional to 2,920, 4,029.60 and 1,990.12

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Solution

The fourth proportional to 2,920, 4,029.60 and 1,990.12 is: 2,746.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920 : 4,029.60 = 1,990.12 : x
  2. Step 2: Convert to fraction form
    2,920/4,029.60 = 1,990.12/x
  3. Step 3: Cross multiply
    2,920x = 4,029.60 × 1,990.12
  4. Step 4: Simplify right side
    2,920x = 8,019,387.55
  5. Step 5: Solve for x
    x = 8,019,387.55/2,920
  6. Step 6: Final answer
    x = 2,746.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.