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Finding the Fourth Proportional to 39,969.62, 59,990.74 and 21,265.30

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Solution

The fourth proportional to 39,969.62, 59,990.74 and 21,265.30 is: 31,917.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,969.62 : 59,990.74 = 21,265.30 : x
  2. Step 2: Convert to fraction form
    39,969.62/59,990.74 = 21,265.30/x
  3. Step 3: Cross multiply
    39,969.62x = 59,990.74 × 21,265.30
  4. Step 4: Simplify right side
    39,969.62x = 1,275,721,083.32
  5. Step 5: Solve for x
    x = 1,275,721,083.32/39,969.62
  6. Step 6: Final answer
    x = 31,917.27

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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.