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Finding the Fourth Proportional to 91,806.40, 138,001.20 and 86,557.60

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Solution

The fourth proportional to 91,806.40, 138,001.20 and 86,557.60 is: 130,111.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,806.40 : 138,001.20 = 86,557.60 : x
  2. Step 2: Convert to fraction form
    91,806.40/138,001.20 = 86,557.60/x
  3. Step 3: Cross multiply
    91,806.40x = 138,001.20 × 86,557.60
  4. Step 4: Simplify right side
    91,806.40x = 11,945,052,669.12
  5. Step 5: Solve for x
    x = 11,945,052,669.12/91,806.40
  6. Step 6: Final answer
    x = 130,111.33

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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.