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Finding the Fourth Proportional to 80,740, 111,421.20 and 45,412

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Solution

The fourth proportional to 80,740, 111,421.20 and 45,412 is: 62,668.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,740 : 111,421.20 = 45,412 : x
  2. Step 2: Convert to fraction form
    80,740/111,421.20 = 45,412/x
  3. Step 3: Cross multiply
    80,740x = 111,421.20 × 45,412
  4. Step 4: Simplify right side
    80,740x = 5,059,859,534.40
  5. Step 5: Solve for x
    x = 5,059,859,534.40/80,740
  6. Step 6: Final answer
    x = 62,668.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.