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Finding the Fourth Proportional to 42,448.40, 63,672.60 and 21,453.20

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Solution

The fourth proportional to 42,448.40, 63,672.60 and 21,453.20 is: 32,179.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,448.40 : 63,672.60 = 21,453.20 : x
  2. Step 2: Convert to fraction form
    42,448.40/63,672.60 = 21,453.20/x
  3. Step 3: Cross multiply
    42,448.40x = 63,672.60 × 21,453.20
  4. Step 4: Simplify right side
    42,448.40x = 1,365,981,022.32
  5. Step 5: Solve for x
    x = 1,365,981,022.32/42,448.40
  6. Step 6: Final answer
    x = 32,179.80

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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.