Home / 30,919.11-42,654.36-18,978.09

Finding the Fourth Proportional to 30,919.11, 42,654.36 and 18,978.09

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Solution

The fourth proportional to 30,919.11, 42,654.36 and 18,978.09 is: 26,181.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,919.11 : 42,654.36 = 18,978.09 : x
  2. Step 2: Convert to fraction form
    30,919.11/42,654.36 = 18,978.09/x
  3. Step 3: Cross multiply
    30,919.11x = 42,654.36 × 18,978.09
  4. Step 4: Simplify right side
    30,919.11x = 809,498,282.97
  5. Step 5: Solve for x
    x = 809,498,282.97/30,919.11
  6. Step 6: Final answer
    x = 26,181.16

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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.