Home / 21,878.20-30,219.78-18,359.56

Finding the Fourth Proportional to 21,878.20, 30,219.78 and 18,359.56

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Solution

The fourth proportional to 21,878.20, 30,219.78 and 18,359.56 is: 25,359.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,878.20 : 30,219.78 = 18,359.56 : x
  2. Step 2: Convert to fraction form
    21,878.20/30,219.78 = 18,359.56/x
  3. Step 3: Cross multiply
    21,878.20x = 30,219.78 × 18,359.56
  4. Step 4: Simplify right side
    21,878.20x = 554,821,864.10
  5. Step 5: Solve for x
    x = 554,821,864.10/21,878.20
  6. Step 6: Final answer
    x = 25,359.58

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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.