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Finding the Fourth Proportional to 86,749.76, 129,916.20 and 74,198

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Solution

The fourth proportional to 86,749.76, 129,916.20 and 74,198 is: 111,118.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,749.76 : 129,916.20 = 74,198 : x
  2. Step 2: Convert to fraction form
    86,749.76/129,916.20 = 74,198/x
  3. Step 3: Cross multiply
    86,749.76x = 129,916.20 × 74,198
  4. Step 4: Simplify right side
    86,749.76x = 9,639,522,207.60
  5. Step 5: Solve for x
    x = 9,639,522,207.60/86,749.76
  6. Step 6: Final answer
    x = 111,118.72

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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.