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Finding the Fourth Proportional to 86,520.80, 129,854.10 and 39,208.70

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Solution

The fourth proportional to 86,520.80, 129,854.10 and 39,208.70 is: 58,846.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,520.80 : 129,854.10 = 39,208.70 : x
  2. Step 2: Convert to fraction form
    86,520.80/129,854.10 = 39,208.70/x
  3. Step 3: Cross multiply
    86,520.80x = 129,854.10 × 39,208.70
  4. Step 4: Simplify right side
    86,520.80x = 5,091,410,450.67
  5. Step 5: Solve for x
    x = 5,091,410,450.67/86,520.80
  6. Step 6: Final answer
    x = 58,846.09

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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.