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Finding the Fourth Proportional to 66,558, 99,840.24 and 19,811.28

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Solution

The fourth proportional to 66,558, 99,840.24 and 19,811.28 is: 29,717.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,558 : 99,840.24 = 19,811.28 : x
  2. Step 2: Convert to fraction form
    66,558/99,840.24 = 19,811.28/x
  3. Step 3: Cross multiply
    66,558x = 99,840.24 × 19,811.28
  4. Step 4: Simplify right side
    66,558x = 1,977,962,949.91
  5. Step 5: Solve for x
    x = 1,977,962,949.91/66,558
  6. Step 6: Final answer
    x = 29,717.88

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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.