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Finding the Fourth Proportional to 112,515.80, 168,773.70 and 86,271.80

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Solution

The fourth proportional to 112,515.80, 168,773.70 and 86,271.80 is: 129,407.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,515.80 : 168,773.70 = 86,271.80 : x
  2. Step 2: Convert to fraction form
    112,515.80/168,773.70 = 86,271.80/x
  3. Step 3: Cross multiply
    112,515.80x = 168,773.70 × 86,271.80
  4. Step 4: Simplify right side
    112,515.80x = 14,560,410,891.66
  5. Step 5: Solve for x
    x = 14,560,410,891.66/112,515.80
  6. Step 6: Final answer
    x = 129,407.70

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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.