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Finding the Fourth Proportional to 79,738.80, 118,666.92 and 77,081.28

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Solution

The fourth proportional to 79,738.80, 118,666.92 and 77,081.28 is: 114,712.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,738.80 : 118,666.92 = 77,081.28 : x
  2. Step 2: Convert to fraction form
    79,738.80/118,666.92 = 77,081.28/x
  3. Step 3: Cross multiply
    79,738.80x = 118,666.92 × 77,081.28
  4. Step 4: Simplify right side
    79,738.80x = 9,146,998,087.26
  5. Step 5: Solve for x
    x = 9,146,998,087.26/79,738.80
  6. Step 6: Final answer
    x = 114,712.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.