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Finding the Fourth Proportional to 71,618.91, 98,836.35 and 39,790.35

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Solution

The fourth proportional to 71,618.91, 98,836.35 and 39,790.35 is: 54,911.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,618.91 : 98,836.35 = 39,790.35 : x
  2. Step 2: Convert to fraction form
    71,618.91/98,836.35 = 39,790.35/x
  3. Step 3: Cross multiply
    71,618.91x = 98,836.35 × 39,790.35
  4. Step 4: Simplify right side
    71,618.91x = 3,932,732,959.22
  5. Step 5: Solve for x
    x = 3,932,732,959.22/71,618.91
  6. Step 6: Final answer
    x = 54,911.94

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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.