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Finding the Fourth Proportional to 98,874.78, 136,456.98 and 56,439.69

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Solution

The fourth proportional to 98,874.78, 136,456.98 and 56,439.69 is: 77,892.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,874.78 : 136,456.98 = 56,439.69 : x
  2. Step 2: Convert to fraction form
    98,874.78/136,456.98 = 56,439.69/x
  3. Step 3: Cross multiply
    98,874.78x = 136,456.98 × 56,439.69
  4. Step 4: Simplify right side
    98,874.78x = 7,701,589,649.54
  5. Step 5: Solve for x
    x = 7,701,589,649.54/98,874.78
  6. Step 6: Final answer
    x = 77,892.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.