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Finding the Fourth Proportional to 66,590.91, 99,871.38 and 19,195.79

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Solution

The fourth proportional to 66,590.91, 99,871.38 and 19,195.79 is: 28,789.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,590.91 : 99,871.38 = 19,195.79 : x
  2. Step 2: Convert to fraction form
    66,590.91/99,871.38 = 19,195.79/x
  3. Step 3: Cross multiply
    66,590.91x = 99,871.38 × 19,195.79
  4. Step 4: Simplify right side
    66,590.91x = 1,917,109,538.13
  5. Step 5: Solve for x
    x = 1,917,109,538.13/66,590.91
  6. Step 6: Final answer
    x = 28,789.36

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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.