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Finding the Fourth Proportional to 92,279.70, 138,419.55 and 78,993.68

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Solution

The fourth proportional to 92,279.70, 138,419.55 and 78,993.68 is: 118,490.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,279.70 : 138,419.55 = 78,993.68 : x
  2. Step 2: Convert to fraction form
    92,279.70/138,419.55 = 78,993.68/x
  3. Step 3: Cross multiply
    92,279.70x = 138,419.55 × 78,993.68
  4. Step 4: Simplify right side
    92,279.70x = 10,934,268,946.35
  5. Step 5: Solve for x
    x = 10,934,268,946.35/92,279.70
  6. Step 6: Final answer
    x = 118,490.51

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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.