Home / 120,128.39-165,778.21-66,415.67

Finding the Fourth Proportional to 120,128.39, 165,778.21 and 66,415.67

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Solution

The fourth proportional to 120,128.39, 165,778.21 and 66,415.67 is: 91,654.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,128.39 : 165,778.21 = 66,415.67 : x
  2. Step 2: Convert to fraction form
    120,128.39/165,778.21 = 66,415.67/x
  3. Step 3: Cross multiply
    120,128.39x = 165,778.21 × 66,415.67
  4. Step 4: Simplify right side
    120,128.39x = 11,010,270,888.55
  5. Step 5: Solve for x
    x = 11,010,270,888.55/120,128.39
  6. Step 6: Final answer
    x = 91,654.20

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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.