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Finding the Fourth Proportional to 66,647.52, 99,961.20 and 19,904.40

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Solution

The fourth proportional to 66,647.52, 99,961.20 and 19,904.40 is: 29,853.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,647.52 : 99,961.20 = 19,904.40 : x
  2. Step 2: Convert to fraction form
    66,647.52/99,961.20 = 19,904.40/x
  3. Step 3: Cross multiply
    66,647.52x = 99,961.20 × 19,904.40
  4. Step 4: Simplify right side
    66,647.52x = 1,989,667,709.28
  5. Step 5: Solve for x
    x = 1,989,667,709.28/66,647.52
  6. Step 6: Final answer
    x = 29,853.59

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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.