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Finding the Fourth Proportional to 85,303.80, 127,725.30 and 66,871.80

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Solution

The fourth proportional to 85,303.80, 127,725.30 and 66,871.80 is: 100,127.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,303.80 : 127,725.30 = 66,871.80 : x
  2. Step 2: Convert to fraction form
    85,303.80/127,725.30 = 66,871.80/x
  3. Step 3: Cross multiply
    85,303.80x = 127,725.30 × 66,871.80
  4. Step 4: Simplify right side
    85,303.80x = 8,541,220,716.54
  5. Step 5: Solve for x
    x = 8,541,220,716.54/85,303.80
  6. Step 6: Final answer
    x = 100,127.08

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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.