Home / 20,863.81-28,775.30-18,340.55

Finding the Fourth Proportional to 20,863.81, 28,775.30 and 18,340.55

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Solution

The fourth proportional to 20,863.81, 28,775.30 and 18,340.55 is: 25,295.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,863.81 : 28,775.30 = 18,340.55 : x
  2. Step 2: Convert to fraction form
    20,863.81/28,775.30 = 18,340.55/x
  3. Step 3: Cross multiply
    20,863.81x = 28,775.30 × 18,340.55
  4. Step 4: Simplify right side
    20,863.81x = 527,754,736.71
  5. Step 5: Solve for x
    x = 527,754,736.71/20,863.81
  6. Step 6: Final answer
    x = 25,295.23

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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.