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Finding the Fourth Proportional to 381,429.60, 572,403.60 and 212,949.60

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Solution

The fourth proportional to 381,429.60, 572,403.60 and 212,949.60 is: 319,569.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,429.60 : 572,403.60 = 212,949.60 : x
  2. Step 2: Convert to fraction form
    381,429.60/572,403.60 = 212,949.60/x
  3. Step 3: Cross multiply
    381,429.60x = 572,403.60 × 212,949.60
  4. Step 4: Simplify right side
    381,429.60x = 121,893,117,658.56
  5. Step 5: Solve for x
    x = 121,893,117,658.56/381,429.60
  6. Step 6: Final answer
    x = 319,569.11

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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.