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Finding the Fourth Proportional to 243,121.86, 364,845.69 and 85,350.78

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Solution

The fourth proportional to 243,121.86, 364,845.69 and 85,350.78 is: 128,083.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,121.86 : 364,845.69 = 85,350.78 : x
  2. Step 2: Convert to fraction form
    243,121.86/364,845.69 = 85,350.78/x
  3. Step 3: Cross multiply
    243,121.86x = 364,845.69 × 85,350.78
  4. Step 4: Simplify right side
    243,121.86x = 31,139,864,221.14
  5. Step 5: Solve for x
    x = 31,139,864,221.14/243,121.86
  6. Step 6: Final answer
    x = 128,083.36

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1.5x scale

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.