Home / 20,919.10-31,378.45-5,124.21

Finding the Fourth Proportional to 20,919.10, 31,378.45 and 5,124.21

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Solution

The fourth proportional to 20,919.10, 31,378.45 and 5,124.21 is: 7,686.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.10 : 31,378.45 = 5,124.21 : x
  2. Step 2: Convert to fraction form
    20,919.10/31,378.45 = 5,124.21/x
  3. Step 3: Cross multiply
    20,919.10x = 31,378.45 × 5,124.21
  4. Step 4: Simplify right side
    20,919.10x = 160,789,767.27
  5. Step 5: Solve for x
    x = 160,789,767.27/20,919.10
  6. Step 6: Final answer
    x = 7,686.27

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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.