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Finding the Fourth Proportional to 100,346.51, 138,479.74 and 55,028.63

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Solution

The fourth proportional to 100,346.51, 138,479.74 and 55,028.63 is: 75,940.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,346.51 : 138,479.74 = 55,028.63 : x
  2. Step 2: Convert to fraction form
    100,346.51/138,479.74 = 55,028.63/x
  3. Step 3: Cross multiply
    100,346.51x = 138,479.74 × 55,028.63
  4. Step 4: Simplify right side
    100,346.51x = 7,620,350,374.96
  5. Step 5: Solve for x
    x = 7,620,350,374.96/100,346.51
  6. Step 6: Final answer
    x = 75,940.36

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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.