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Finding the Fourth Proportional to 499,998.78, 749,998.56 and 126,021.78

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Solution

The fourth proportional to 499,998.78, 749,998.56 and 126,021.78 is: 189,032.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,998.78 : 749,998.56 = 126,021.78 : x
  2. Step 2: Convert to fraction form
    499,998.78/749,998.56 = 126,021.78/x
  3. Step 3: Cross multiply
    499,998.78x = 749,998.56 × 126,021.78
  4. Step 4: Simplify right side
    499,998.78x = 94,516,153,528.64
  5. Step 5: Solve for x
    x = 94,516,153,528.64/499,998.78
  6. Step 6: Final answer
    x = 189,032.77

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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.