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Finding the Fourth Proportional to 66,171.64, 99,242.52 and 19,428.16

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Solution

The fourth proportional to 66,171.64, 99,242.52 and 19,428.16 is: 29,137.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,171.64 : 99,242.52 = 19,428.16 : x
  2. Step 2: Convert to fraction form
    66,171.64/99,242.52 = 19,428.16/x
  3. Step 3: Cross multiply
    66,171.64x = 99,242.52 × 19,428.16
  4. Step 4: Simplify right side
    66,171.64x = 1,928,099,557.36
  5. Step 5: Solve for x
    x = 1,928,099,557.36/66,171.64
  6. Step 6: Final answer
    x = 29,137.85

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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.