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Finding the Fourth Proportional to 28,757.60, 39,680.78 and 16,653.78

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Solution

The fourth proportional to 28,757.60, 39,680.78 and 16,653.78 is: 22,979.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,757.60 : 39,680.78 = 16,653.78 : x
  2. Step 2: Convert to fraction form
    28,757.60/39,680.78 = 16,653.78/x
  3. Step 3: Cross multiply
    28,757.60x = 39,680.78 × 16,653.78
  4. Step 4: Simplify right side
    28,757.60x = 660,834,980.35
  5. Step 5: Solve for x
    x = 660,834,980.35/28,757.60
  6. Step 6: Final answer
    x = 22,979.49

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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.