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Finding the Fourth Proportional to 79,749.60, 119,721.60 and 40,286.40

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Solution

The fourth proportional to 79,749.60, 119,721.60 and 40,286.40 is: 60,478.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,749.60 : 119,721.60 = 40,286.40 : x
  2. Step 2: Convert to fraction form
    79,749.60/119,721.60 = 40,286.40/x
  3. Step 3: Cross multiply
    79,749.60x = 119,721.60 × 40,286.40
  4. Step 4: Simplify right side
    79,749.60x = 4,823,152,266.24
  5. Step 5: Solve for x
    x = 4,823,152,266.24/79,749.60
  6. Step 6: Final answer
    x = 60,478.70

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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.