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Finding the Fourth Proportional to 78,060.60, 107,694.81 and 51,218.01

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Solution

The fourth proportional to 78,060.60, 107,694.81 and 51,218.01 is: 70,661.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,060.60 : 107,694.81 = 51,218.01 : x
  2. Step 2: Convert to fraction form
    78,060.60/107,694.81 = 51,218.01/x
  3. Step 3: Cross multiply
    78,060.60x = 107,694.81 × 51,218.01
  4. Step 4: Simplify right side
    78,060.60x = 5,515,913,855.53
  5. Step 5: Solve for x
    x = 5,515,913,855.53/78,060.60
  6. Step 6: Final answer
    x = 70,661.95

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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.