Home / 120,139.07-165,783.78-66,416.84

Finding the Fourth Proportional to 120,139.07, 165,783.78 and 66,416.84

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Solution

The fourth proportional to 120,139.07, 165,783.78 and 66,416.84 is: 91,650.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,139.07 : 165,783.78 = 66,416.84 : x
  2. Step 2: Convert to fraction form
    120,139.07/165,783.78 = 66,416.84/x
  3. Step 3: Cross multiply
    120,139.07x = 165,783.78 × 66,416.84
  4. Step 4: Simplify right side
    120,139.07x = 11,010,833,961.94
  5. Step 5: Solve for x
    x = 11,010,833,961.94/120,139.07
  6. Step 6: Final answer
    x = 91,650.74

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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.