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Finding the Fourth Proportional to 1,990,334.40, 2,992,874.40 and 1,665,931.20

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Solution

The fourth proportional to 1,990,334.40, 2,992,874.40 and 1,665,931.20 is: 2,505,067.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990,334.40 : 2,992,874.40 = 1,665,931.20 : x
  2. Step 2: Convert to fraction form
    1,990,334.40/2,992,874.40 = 1,665,931.20/x
  3. Step 3: Cross multiply
    1,990,334.40x = 2,992,874.40 × 1,665,931.20
  4. Step 4: Simplify right side
    1,990,334.40x = 4,985,922,840,641.28
  5. Step 5: Solve for x
    x = 4,985,922,840,641.28/1,990,334.40
  6. Step 6: Final answer
    x = 2,505,067.91

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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.