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Finding the Fourth Proportional to 100,620.80, 138,849.97 and 55,297.80

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Solution

The fourth proportional to 100,620.80, 138,849.97 and 55,297.80 is: 76,307.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,620.80 : 138,849.97 = 55,297.80 : x
  2. Step 2: Convert to fraction form
    100,620.80/138,849.97 = 55,297.80/x
  3. Step 3: Cross multiply
    100,620.80x = 138,849.97 × 55,297.80
  4. Step 4: Simplify right side
    100,620.80x = 7,678,097,871.07
  5. Step 5: Solve for x
    x = 7,678,097,871.07/100,620.80
  6. Step 6: Final answer
    x = 76,307.26

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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.