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Finding the Fourth Proportional to 79,878.03, 110,129.37 and 65,485.76

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Solution

The fourth proportional to 79,878.03, 110,129.37 and 65,485.76 is: 90,286.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,878.03 : 110,129.37 = 65,485.76 : x
  2. Step 2: Convert to fraction form
    79,878.03/110,129.37 = 65,485.76/x
  3. Step 3: Cross multiply
    79,878.03x = 110,129.37 × 65,485.76
  4. Step 4: Simplify right side
    79,878.03x = 7,211,904,942.12
  5. Step 5: Solve for x
    x = 7,211,904,942.12/79,878.03
  6. Step 6: Final answer
    x = 90,286.46

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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.