Home / 21,118.72-31,639.20-18,785.92

Finding the Fourth Proportional to 21,118.72, 31,639.20 and 18,785.92

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Solution

The fourth proportional to 21,118.72, 31,639.20 and 18,785.92 is: 28,144.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.72 : 31,639.20 = 18,785.92 : x
  2. Step 2: Convert to fraction form
    21,118.72/31,639.20 = 18,785.92/x
  3. Step 3: Cross multiply
    21,118.72x = 31,639.20 × 18,785.92
  4. Step 4: Simplify right side
    21,118.72x = 594,371,480.06
  5. Step 5: Solve for x
    x = 594,371,480.06/21,118.72
  6. Step 6: Final answer
    x = 28,144.29

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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.