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Finding the Fourth Proportional to 100,346.64, 138,479.92 and 55,028.76

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Solution

The fourth proportional to 100,346.64, 138,479.92 and 55,028.76 is: 75,940.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,346.64 : 138,479.92 = 55,028.76 : x
  2. Step 2: Convert to fraction form
    100,346.64/138,479.92 = 55,028.76/x
  3. Step 3: Cross multiply
    100,346.64x = 138,479.92 × 55,028.76
  4. Step 4: Simplify right side
    100,346.64x = 7,620,378,282.50
  5. Step 5: Solve for x
    x = 7,620,378,282.50/100,346.64
  6. Step 6: Final answer
    x = 75,940.54

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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.