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Finding the Fourth Proportional to 39,484.80, 54,489.78 and 21,580.56

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Solution

The fourth proportional to 39,484.80, 54,489.78 and 21,580.56 is: 29,781.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,484.80 : 54,489.78 = 21,580.56 : x
  2. Step 2: Convert to fraction form
    39,484.80/54,489.78 = 21,580.56/x
  3. Step 3: Cross multiply
    39,484.80x = 54,489.78 × 21,580.56
  4. Step 4: Simplify right side
    39,484.80x = 1,175,919,966.68
  5. Step 5: Solve for x
    x = 1,175,919,966.68/39,484.80
  6. Step 6: Final answer
    x = 29,781.59

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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.