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Finding the Fourth Proportional to 100,661.54, 138,907.57 and 55,330.80

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Solution

The fourth proportional to 100,661.54, 138,907.57 and 55,330.80 is: 76,353.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,661.54 : 138,907.57 = 55,330.80 : x
  2. Step 2: Convert to fraction form
    100,661.54/138,907.57 = 55,330.80/x
  3. Step 3: Cross multiply
    100,661.54x = 138,907.57 × 55,330.80
  4. Step 4: Simplify right side
    100,661.54x = 7,685,866,974.16
  5. Step 5: Solve for x
    x = 7,685,866,974.16/100,661.54
  6. Step 6: Final answer
    x = 76,353.56

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1.5x scale

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.