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Finding the Fourth Proportional to 91,805.40, 137,999.70 and 86,556.60

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Solution

The fourth proportional to 91,805.40, 137,999.70 and 86,556.60 is: 130,109.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,805.40 : 137,999.70 = 86,556.60 : x
  2. Step 2: Convert to fraction form
    91,805.40/137,999.70 = 86,556.60/x
  3. Step 3: Cross multiply
    91,805.40x = 137,999.70 × 86,556.60
  4. Step 4: Simplify right side
    91,805.40x = 11,944,784,833.02
  5. Step 5: Solve for x
    x = 11,944,784,833.02/91,805.40
  6. Step 6: Final answer
    x = 130,109.83

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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.