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Finding the Fourth Proportional to 66,520, 99,796.44 and 19,772.68

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Solution

The fourth proportional to 66,520, 99,796.44 and 19,772.68 is: 29,663.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,520 : 99,796.44 = 19,772.68 : x
  2. Step 2: Convert to fraction form
    66,520/99,796.44 = 19,772.68/x
  3. Step 3: Cross multiply
    66,520x = 99,796.44 × 19,772.68
  4. Step 4: Simplify right side
    66,520x = 1,973,243,073.26
  5. Step 5: Solve for x
    x = 1,973,243,073.26/66,520
  6. Step 6: Final answer
    x = 29,663.91

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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.