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Finding the Fourth Proportional to 89,855.60, 134,815.80 and 86,615.60

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Solution

The fourth proportional to 89,855.60, 134,815.80 and 86,615.60 is: 129,954.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,855.60 : 134,815.80 = 86,615.60 : x
  2. Step 2: Convert to fraction form
    89,855.60/134,815.80 = 86,615.60/x
  3. Step 3: Cross multiply
    89,855.60x = 134,815.80 × 86,615.60
  4. Step 4: Simplify right side
    89,855.60x = 11,677,151,406.48
  5. Step 5: Solve for x
    x = 11,677,151,406.48/89,855.60
  6. Step 6: Final answer
    x = 129,954.63

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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.