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Finding the Fourth Proportional to 28,169.84, 38,871.24 and 15,591.44

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Solution

The fourth proportional to 28,169.84, 38,871.24 and 15,591.44 is: 21,514.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,169.84 : 38,871.24 = 15,591.44 : x
  2. Step 2: Convert to fraction form
    28,169.84/38,871.24 = 15,591.44/x
  3. Step 3: Cross multiply
    28,169.84x = 38,871.24 × 15,591.44
  4. Step 4: Simplify right side
    28,169.84x = 606,058,606.19
  5. Step 5: Solve for x
    x = 606,058,606.19/28,169.84
  6. Step 6: Final answer
    x = 21,514.45

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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.