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Finding the Fourth Proportional to 28,959.05, 39,965.28 and 16,859.78

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Solution

The fourth proportional to 28,959.05, 39,965.28 and 16,859.78 is: 23,267.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,959.05 : 39,965.28 = 16,859.78 : x
  2. Step 2: Convert to fraction form
    28,959.05/39,965.28 = 16,859.78/x
  3. Step 3: Cross multiply
    28,959.05x = 39,965.28 × 16,859.78
  4. Step 4: Simplify right side
    28,959.05x = 673,805,715.26
  5. Step 5: Solve for x
    x = 673,805,715.26/28,959.05
  6. Step 6: Final answer
    x = 23,267.53

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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.