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Finding the Fourth Proportional to 66,086.64, 99,170.32 and 28,639.44

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Solution

The fourth proportional to 66,086.64, 99,170.32 and 28,639.44 is: 42,976.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,086.64 : 99,170.32 = 28,639.44 : x
  2. Step 2: Convert to fraction form
    66,086.64/99,170.32 = 28,639.44/x
  3. Step 3: Cross multiply
    66,086.64x = 99,170.32 × 28,639.44
  4. Step 4: Simplify right side
    66,086.64x = 2,840,182,429.42
  5. Step 5: Solve for x
    x = 2,840,182,429.42/66,086.64
  6. Step 6: Final answer
    x = 42,976.65

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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.