Home / 28,778.16-39,711-21,228.57

Finding the Fourth Proportional to 28,778.16, 39,711 and 21,228.57

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Solution

The fourth proportional to 28,778.16, 39,711 and 21,228.57 is: 29,293.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,778.16 : 39,711 = 21,228.57 : x
  2. Step 2: Convert to fraction form
    28,778.16/39,711 = 21,228.57/x
  3. Step 3: Cross multiply
    28,778.16x = 39,711 × 21,228.57
  4. Step 4: Simplify right side
    28,778.16x = 843,007,743.27
  5. Step 5: Solve for x
    x = 843,007,743.27/28,778.16
  6. Step 6: Final answer
    x = 29,293.32

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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.