Home / 28,869.75-39,840.39-15,621.75

Finding the Fourth Proportional to 28,869.75, 39,840.39 and 15,621.75

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Solution

The fourth proportional to 28,869.75, 39,840.39 and 15,621.75 is: 21,558.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,869.75 : 39,840.39 = 15,621.75 : x
  2. Step 2: Convert to fraction form
    28,869.75/39,840.39 = 15,621.75/x
  3. Step 3: Cross multiply
    28,869.75x = 39,840.39 × 15,621.75
  4. Step 4: Simplify right side
    28,869.75x = 622,376,612.48
  5. Step 5: Solve for x
    x = 622,376,612.48/28,869.75
  6. Step 6: Final answer
    x = 21,558.09

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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.