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Finding the Fourth Proportional to 66,458.57, 99,693.26 and 19,711.31

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Solution

The fourth proportional to 66,458.57, 99,693.26 and 19,711.31 is: 29,568.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,458.57 : 99,693.26 = 19,711.31 : x
  2. Step 2: Convert to fraction form
    66,458.57/99,693.26 = 19,711.31/x
  3. Step 3: Cross multiply
    66,458.57x = 99,693.26 × 19,711.31
  4. Step 4: Simplify right side
    66,458.57x = 1,965,084,977.36
  5. Step 5: Solve for x
    x = 1,965,084,977.36/66,458.57
  6. Step 6: Final answer
    x = 29,568.57

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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.