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Finding the Fourth Proportional to 79,749.40, 119,624.10 and 76,687.60

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Solution

The fourth proportional to 79,749.40, 119,624.10 and 76,687.60 is: 115,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,749.40 : 119,624.10 = 76,687.60 : x
  2. Step 2: Convert to fraction form
    79,749.40/119,624.10 = 76,687.60/x
  3. Step 3: Cross multiply
    79,749.40x = 119,624.10 × 76,687.60
  4. Step 4: Simplify right side
    79,749.40x = 9,173,685,131.16
  5. Step 5: Solve for x
    x = 9,173,685,131.16/79,749.40
  6. Step 6: Final answer
    x = 115,031.40

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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.