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Finding the Fourth Proportional to 71,128.71, 98,157.69 and 39,297.87

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Solution

The fourth proportional to 71,128.71, 98,157.69 and 39,297.87 is: 54,231.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,128.71 : 98,157.69 = 39,297.87 : x
  2. Step 2: Convert to fraction form
    71,128.71/98,157.69 = 39,297.87/x
  3. Step 3: Cross multiply
    71,128.71x = 98,157.69 × 39,297.87
  4. Step 4: Simplify right side
    71,128.71x = 3,857,388,141.12
  5. Step 5: Solve for x
    x = 3,857,388,141.12/71,128.71
  6. Step 6: Final answer
    x = 54,231.10

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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.