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Finding the Fourth Proportional to 71,703.07, 98,946.15 and 39,871.28

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Solution

The fourth proportional to 71,703.07, 98,946.15 and 39,871.28 is: 55,020.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,703.07 : 98,946.15 = 39,871.28 : x
  2. Step 2: Convert to fraction form
    71,703.07/98,946.15 = 39,871.28/x
  3. Step 3: Cross multiply
    71,703.07x = 98,946.15 × 39,871.28
  4. Step 4: Simplify right side
    71,703.07x = 3,945,109,651.57
  5. Step 5: Solve for x
    x = 3,945,109,651.57/71,703.07
  6. Step 6: Final answer
    x = 55,020.09

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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.