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Finding the Fourth Proportional to 71,979.30, 100,639.80 and 71,979.30

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Solution

The fourth proportional to 71,979.30, 100,639.80 and 71,979.30 is: 100,639.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,979.30 : 100,639.80 = 71,979.30 : x
  2. Step 2: Convert to fraction form
    71,979.30/100,639.80 = 71,979.30/x
  3. Step 3: Cross multiply
    71,979.30x = 100,639.80 × 71,979.30
  4. Step 4: Simplify right side
    71,979.30x = 7,243,982,356.14
  5. Step 5: Solve for x
    x = 7,243,982,356.14/71,979.30
  6. Step 6: Final answer
    x = 100,639.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.