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Finding the Fourth Proportional to 20,348.80, 30,494 and 11,565.12

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Solution

The fourth proportional to 20,348.80, 30,494 and 11,565.12 is: 17,331.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,348.80 : 30,494 = 11,565.12 : x
  2. Step 2: Convert to fraction form
    20,348.80/30,494 = 11,565.12/x
  3. Step 3: Cross multiply
    20,348.80x = 30,494 × 11,565.12
  4. Step 4: Simplify right side
    20,348.80x = 352,666,769.28
  5. Step 5: Solve for x
    x = 352,666,769.28/20,348.80
  6. Step 6: Final answer
    x = 17,331.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.