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Finding the Fourth Proportional to 77,978.85, 107,639.98 and 60,717.09

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Solution

The fourth proportional to 77,978.85, 107,639.98 and 60,717.09 is: 83,812.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,978.85 : 107,639.98 = 60,717.09 : x
  2. Step 2: Convert to fraction form
    77,978.85/107,639.98 = 60,717.09/x
  3. Step 3: Cross multiply
    77,978.85x = 107,639.98 × 60,717.09
  4. Step 4: Simplify right side
    77,978.85x = 6,535,586,201.47
  5. Step 5: Solve for x
    x = 6,535,586,201.47/77,978.85
  6. Step 6: Final answer
    x = 83,812.29

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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.