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Finding the Fourth Proportional to 85,739.40, 128,390.40 and 68,243.40

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Solution

The fourth proportional to 85,739.40, 128,390.40 and 68,243.40 is: 102,191.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,739.40 : 128,390.40 = 68,243.40 : x
  2. Step 2: Convert to fraction form
    85,739.40/128,390.40 = 68,243.40/x
  3. Step 3: Cross multiply
    85,739.40x = 128,390.40 × 68,243.40
  4. Step 4: Simplify right side
    85,739.40x = 8,761,797,423.36
  5. Step 5: Solve for x
    x = 8,761,797,423.36/85,739.40
  6. Step 6: Final answer
    x = 102,191.03

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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.