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Finding the Fourth Proportional to 86,671.80, 129,813.30 and 71,119.80

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Solution

The fourth proportional to 86,671.80, 129,813.30 and 71,119.80 is: 106,520.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,671.80 : 129,813.30 = 71,119.80 : x
  2. Step 2: Convert to fraction form
    86,671.80/129,813.30 = 71,119.80/x
  3. Step 3: Cross multiply
    86,671.80x = 129,813.30 × 71,119.80
  4. Step 4: Simplify right side
    86,671.80x = 9,232,295,933.34
  5. Step 5: Solve for x
    x = 9,232,295,933.34/86,671.80
  6. Step 6: Final answer
    x = 106,520.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.