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Finding the Fourth Proportional to 71,643.28, 98,870.36 and 39,815.32

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Solution

The fourth proportional to 71,643.28, 98,870.36 and 39,815.32 is: 54,946.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,643.28 : 98,870.36 = 39,815.32 : x
  2. Step 2: Convert to fraction form
    71,643.28/98,870.36 = 39,815.32/x
  3. Step 3: Cross multiply
    71,643.28x = 98,870.36 × 39,815.32
  4. Step 4: Simplify right side
    71,643.28x = 3,936,555,021.92
  5. Step 5: Solve for x
    x = 3,936,555,021.92/71,643.28
  6. Step 6: Final answer
    x = 54,946.61

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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.