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Finding the Fourth Proportional to 2,919.68, 4,380.21 and 971.90

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Solution

The fourth proportional to 2,919.68, 4,380.21 and 971.90 is: 1,458.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.68 : 4,380.21 = 971.90 : x
  2. Step 2: Convert to fraction form
    2,919.68/4,380.21 = 971.90/x
  3. Step 3: Cross multiply
    2,919.68x = 4,380.21 × 971.90
  4. Step 4: Simplify right side
    2,919.68x = 4,257,104.20
  5. Step 5: Solve for x
    x = 4,257,104.20/2,919.68
  6. Step 6: Final answer
    x = 1,458.07

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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.