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Finding the Fourth Proportional to 28,207.76, 38,911.25 and 17,979.80

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Solution

The fourth proportional to 28,207.76, 38,911.25 and 17,979.80 is: 24,802.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,207.76 : 38,911.25 = 17,979.80 : x
  2. Step 2: Convert to fraction form
    28,207.76/38,911.25 = 17,979.80/x
  3. Step 3: Cross multiply
    28,207.76x = 38,911.25 × 17,979.80
  4. Step 4: Simplify right side
    28,207.76x = 699,616,343.14
  5. Step 5: Solve for x
    x = 699,616,343.14/28,207.76
  6. Step 6: Final answer
    x = 24,802.27

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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.