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Finding the Fourth Proportional to 28,969.80, 39,981.69 and 17,645.92

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Solution

The fourth proportional to 28,969.80, 39,981.69 and 17,645.92 is: 24,353.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,969.80 : 39,981.69 = 17,645.92 : x
  2. Step 2: Convert to fraction form
    28,969.80/39,981.69 = 17,645.92/x
  3. Step 3: Cross multiply
    28,969.80x = 39,981.69 × 17,645.92
  4. Step 4: Simplify right side
    28,969.80x = 705,513,614.98
  5. Step 5: Solve for x
    x = 705,513,614.98/28,969.80
  6. Step 6: Final answer
    x = 24,353.42

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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.