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Finding the Fourth Proportional to 66,015.20, 99,071.40 and 43,821.20

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Solution

The fourth proportional to 66,015.20, 99,071.40 and 43,821.20 is: 65,764.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,015.20 : 99,071.40 = 43,821.20 : x
  2. Step 2: Convert to fraction form
    66,015.20/99,071.40 = 43,821.20/x
  3. Step 3: Cross multiply
    66,015.20x = 99,071.40 × 43,821.20
  4. Step 4: Simplify right side
    66,015.20x = 4,341,427,633.68
  5. Step 5: Solve for x
    x = 4,341,427,633.68/66,015.20
  6. Step 6: Final answer
    x = 65,764.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.