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Finding the Fourth Proportional to 118,747, 163,871.94 and 81,020.44

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Solution

The fourth proportional to 118,747, 163,871.94 and 81,020.44 is: 111,808.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,747 : 163,871.94 = 81,020.44 : x
  2. Step 2: Convert to fraction form
    118,747/163,871.94 = 81,020.44/x
  3. Step 3: Cross multiply
    118,747x = 163,871.94 × 81,020.44
  4. Step 4: Simplify right side
    118,747x = 13,276,976,682.45
  5. Step 5: Solve for x
    x = 13,276,976,682.45/118,747
  6. Step 6: Final answer
    x = 111,808.94

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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.