Home / 28,639.20-42,940.32-13,818.72

Finding the Fourth Proportional to 28,639.20, 42,940.32 and 13,818.72

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Solution

The fourth proportional to 28,639.20, 42,940.32 and 13,818.72 is: 20,719.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,639.20 : 42,940.32 = 13,818.72 : x
  2. Step 2: Convert to fraction form
    28,639.20/42,940.32 = 13,818.72/x
  3. Step 3: Cross multiply
    28,639.20x = 42,940.32 × 13,818.72
  4. Step 4: Simplify right side
    28,639.20x = 593,380,258.79
  5. Step 5: Solve for x
    x = 593,380,258.79/28,639.20
  6. Step 6: Final answer
    x = 20,719.16

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1.5x scale

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.