Home / 1,991,115.78-2,986,419.42-643,138.32

Finding the Fourth Proportional to 1,991,115.78, 2,986,419.42 and 643,138.32

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Solution

The fourth proportional to 1,991,115.78, 2,986,419.42 and 643,138.32 is: 964,625.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991,115.78 : 2,986,419.42 = 643,138.32 : x
  2. Step 2: Convert to fraction form
    1,991,115.78/2,986,419.42 = 643,138.32/x
  3. Step 3: Cross multiply
    1,991,115.78x = 2,986,419.42 × 643,138.32
  4. Step 4: Simplify right side
    1,991,115.78x = 1,920,680,768,594.17
  5. Step 5: Solve for x
    x = 1,920,680,768,594.17/1,991,115.78
  6. Step 6: Final answer
    x = 964,625.36

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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.