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Finding the Fourth Proportional to 66,605.76, 99,908.72 and 19,857.48

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Solution

The fourth proportional to 66,605.76, 99,908.72 and 19,857.48 is: 29,786.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,605.76 : 99,908.72 = 19,857.48 : x
  2. Step 2: Convert to fraction form
    66,605.76/99,908.72 = 19,857.48/x
  3. Step 3: Cross multiply
    66,605.76x = 99,908.72 × 19,857.48
  4. Step 4: Simplify right side
    66,605.76x = 1,983,935,409.23
  5. Step 5: Solve for x
    x = 1,983,935,409.23/66,605.76
  6. Step 6: Final answer
    x = 29,786.24

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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.