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Finding the Fourth Proportional to 28,385.84, 39,165 and 18,938

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Solution

The fourth proportional to 28,385.84, 39,165 and 18,938 is: 26,129.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,385.84 : 39,165 = 18,938 : x
  2. Step 2: Convert to fraction form
    28,385.84/39,165 = 18,938/x
  3. Step 3: Cross multiply
    28,385.84x = 39,165 × 18,938
  4. Step 4: Simplify right side
    28,385.84x = 741,706,770
  5. Step 5: Solve for x
    x = 741,706,770/28,385.84
  6. Step 6: Final answer
    x = 26,129.46

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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.