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Finding the Fourth Proportional to 324,665.80, 486,998.70 and 212,691.40

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Solution

The fourth proportional to 324,665.80, 486,998.70 and 212,691.40 is: 319,037.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    324,665.80 : 486,998.70 = 212,691.40 : x
  2. Step 2: Convert to fraction form
    324,665.80/486,998.70 = 212,691.40/x
  3. Step 3: Cross multiply
    324,665.80x = 486,998.70 × 212,691.40
  4. Step 4: Simplify right side
    324,665.80x = 103,580,435,301.18
  5. Step 5: Solve for x
    x = 103,580,435,301.18/324,665.80
  6. Step 6: Final answer
    x = 319,037.10

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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.