Home / 100,405.09-138,703.22-80,235.55

Finding the Fourth Proportional to 100,405.09, 138,703.22 and 80,235.55

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Solution

The fourth proportional to 100,405.09, 138,703.22 and 80,235.55 is: 110,840.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,405.09 : 138,703.22 = 80,235.55 : x
  2. Step 2: Convert to fraction form
    100,405.09/138,703.22 = 80,235.55/x
  3. Step 3: Cross multiply
    100,405.09x = 138,703.22 × 80,235.55
  4. Step 4: Simplify right side
    100,405.09x = 11,128,929,143.47
  5. Step 5: Solve for x
    x = 11,128,929,143.47/100,405.09
  6. Step 6: Final answer
    x = 110,840.29

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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.