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Finding the Fourth Proportional to 28,731, 39,648.39 and 16,155.78

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Solution

The fourth proportional to 28,731, 39,648.39 and 16,155.78 is: 22,294.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,731 : 39,648.39 = 16,155.78 : x
  2. Step 2: Convert to fraction form
    28,731/39,648.39 = 16,155.78/x
  3. Step 3: Cross multiply
    28,731x = 39,648.39 × 16,155.78
  4. Step 4: Simplify right side
    28,731x = 640,550,666.19
  5. Step 5: Solve for x
    x = 640,550,666.19/28,731
  6. Step 6: Final answer
    x = 22,294.76

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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.