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Finding the Fourth Proportional to 71,485.44, 98,661.72 and 39,664.59

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Solution

The fourth proportional to 71,485.44, 98,661.72 and 39,664.59 is: 54,743.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,485.44 : 98,661.72 = 39,664.59 : x
  2. Step 2: Convert to fraction form
    71,485.44/98,661.72 = 39,664.59/x
  3. Step 3: Cross multiply
    71,485.44x = 98,661.72 × 39,664.59
  4. Step 4: Simplify right side
    71,485.44x = 3,913,376,672.49
  5. Step 5: Solve for x
    x = 3,913,376,672.49/71,485.44
  6. Step 6: Final answer
    x = 54,743.69

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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.