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Finding the Fourth Proportional to 100,620.55, 138,849.62 and 55,297.55

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Solution

The fourth proportional to 100,620.55, 138,849.62 and 55,297.55 is: 76,306.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,620.55 : 138,849.62 = 55,297.55 : x
  2. Step 2: Convert to fraction form
    100,620.55/138,849.62 = 55,297.55/x
  3. Step 3: Cross multiply
    100,620.55x = 138,849.62 × 55,297.55
  4. Step 4: Simplify right side
    100,620.55x = 7,678,044,289.80
  5. Step 5: Solve for x
    x = 7,678,044,289.80/100,620.55
  6. Step 6: Final answer
    x = 76,306.92

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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.