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Finding the Fourth Proportional to 71,521.84, 98,698.26 and 39,689.92

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Solution

The fourth proportional to 71,521.84, 98,698.26 and 39,689.92 is: 54,771.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,521.84 : 98,698.26 = 39,689.92 : x
  2. Step 2: Convert to fraction form
    71,521.84/98,698.26 = 39,689.92/x
  3. Step 3: Cross multiply
    71,521.84x = 98,698.26 × 39,689.92
  4. Step 4: Simplify right side
    71,521.84x = 3,917,326,043.54
  5. Step 5: Solve for x
    x = 3,917,326,043.54/71,521.84
  6. Step 6: Final answer
    x = 54,771.05

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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.