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Finding the Fourth Proportional to 66,421.76, 99,642.24 and 19,668.48

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Solution

The fourth proportional to 66,421.76, 99,642.24 and 19,668.48 is: 29,505.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,421.76 : 99,642.24 = 19,668.48 : x
  2. Step 2: Convert to fraction form
    66,421.76/99,642.24 = 19,668.48/x
  3. Step 3: Cross multiply
    66,421.76x = 99,642.24 × 19,668.48
  4. Step 4: Simplify right side
    66,421.76x = 1,959,811,404.60
  5. Step 5: Solve for x
    x = 1,959,811,404.60/66,421.76
  6. Step 6: Final answer
    x = 29,505.56

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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.