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Finding the Fourth Proportional to 27,731, 38,268.90 and 15,155.72

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Solution

The fourth proportional to 27,731, 38,268.90 and 15,155.72 is: 20,914.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,731 : 38,268.90 = 15,155.72 : x
  2. Step 2: Convert to fraction form
    27,731/38,268.90 = 15,155.72/x
  3. Step 3: Cross multiply
    27,731x = 38,268.90 × 15,155.72
  4. Step 4: Simplify right side
    27,731x = 579,992,733.11
  5. Step 5: Solve for x
    x = 579,992,733.11/27,731
  6. Step 6: Final answer
    x = 20,914.96

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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.