Home / 138,538.89-191,181.47-78,109.65

Finding the Fourth Proportional to 138,538.89, 191,181.47 and 78,109.65

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Solution

The fourth proportional to 138,538.89, 191,181.47 and 78,109.65 is: 107,790.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,538.89 : 191,181.47 = 78,109.65 : x
  2. Step 2: Convert to fraction form
    138,538.89/191,181.47 = 78,109.65/x
  3. Step 3: Cross multiply
    138,538.89x = 191,181.47 × 78,109.65
  4. Step 4: Simplify right side
    138,538.89x = 14,933,117,317.64
  5. Step 5: Solve for x
    x = 14,933,117,317.64/138,538.89
  6. Step 6: Final answer
    x = 107,790.07

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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.