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Finding the Fourth Proportional to 212,358.60, 318,648.56 and 86,092.15

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Solution

The fourth proportional to 212,358.60, 318,648.56 and 86,092.15 is: 129,183.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,358.60 : 318,648.56 = 86,092.15 : x
  2. Step 2: Convert to fraction form
    212,358.60/318,648.56 = 86,092.15/x
  3. Step 3: Cross multiply
    212,358.60x = 318,648.56 × 86,092.15
  4. Step 4: Simplify right side
    212,358.60x = 27,433,139,624.80
  5. Step 5: Solve for x
    x = 27,433,139,624.80/212,358.60
  6. Step 6: Final answer
    x = 129,183.09

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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.