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Finding the Fourth Proportional to 71,120.72, 98,138.22 and 39,287.72

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Solution

The fourth proportional to 71,120.72, 98,138.22 and 39,287.72 is: 54,212.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,120.72 : 98,138.22 = 39,287.72 : x
  2. Step 2: Convert to fraction form
    71,120.72/98,138.22 = 39,287.72/x
  3. Step 3: Cross multiply
    71,120.72x = 98,138.22 × 39,287.72
  4. Step 4: Simplify right side
    71,120.72x = 3,855,626,417.97
  5. Step 5: Solve for x
    x = 3,855,626,417.97/71,120.72
  6. Step 6: Final answer
    x = 54,212.42

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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.