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Finding the Fourth Proportional to 499,978.61, 749,972.78 and 126,001.61

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Solution

The fourth proportional to 499,978.61, 749,972.78 and 126,001.61 is: 189,003.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,978.61 : 749,972.78 = 126,001.61 : x
  2. Step 2: Convert to fraction form
    499,978.61/749,972.78 = 126,001.61/x
  3. Step 3: Cross multiply
    499,978.61x = 749,972.78 × 126,001.61
  4. Step 4: Simplify right side
    499,978.61x = 94,497,777,106.17
  5. Step 5: Solve for x
    x = 94,497,777,106.17/499,978.61
  6. Step 6: Final answer
    x = 189,003.64

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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.