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Finding the Fourth Proportional to 66,486.38, 99,728.78 and 19,102.64

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Solution

The fourth proportional to 66,486.38, 99,728.78 and 19,102.64 is: 28,653.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,486.38 : 99,728.78 = 19,102.64 : x
  2. Step 2: Convert to fraction form
    66,486.38/99,728.78 = 19,102.64/x
  3. Step 3: Cross multiply
    66,486.38x = 99,728.78 × 19,102.64
  4. Step 4: Simplify right side
    66,486.38x = 1,905,082,981.98
  5. Step 5: Solve for x
    x = 1,905,082,981.98/66,486.38
  6. Step 6: Final answer
    x = 28,653.73

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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.