Home / 100,106.85-138,087.40-66,115.41

Finding the Fourth Proportional to 100,106.85, 138,087.40 and 66,115.41

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Solution

The fourth proportional to 100,106.85, 138,087.40 and 66,115.41 is: 91,199.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,106.85 : 138,087.40 = 66,115.41 : x
  2. Step 2: Convert to fraction form
    100,106.85/138,087.40 = 66,115.41/x
  3. Step 3: Cross multiply
    100,106.85x = 138,087.40 × 66,115.41
  4. Step 4: Simplify right side
    100,106.85x = 9,129,705,066.83
  5. Step 5: Solve for x
    x = 9,129,705,066.83/100,106.85
  6. Step 6: Final answer
    x = 91,199.60

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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.