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Finding the Fourth Proportional to 86,668.70, 130,003.05 and 72,671.90

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Solution

The fourth proportional to 86,668.70, 130,003.05 and 72,671.90 is: 109,007.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,668.70 : 130,003.05 = 72,671.90 : x
  2. Step 2: Convert to fraction form
    86,668.70/130,003.05 = 72,671.90/x
  3. Step 3: Cross multiply
    86,668.70x = 130,003.05 × 72,671.90
  4. Step 4: Simplify right side
    86,668.70x = 9,447,568,649.30
  5. Step 5: Solve for x
    x = 9,447,568,649.30/86,668.70
  6. Step 6: Final answer
    x = 109,007.85

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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.