Home / 138,301.28-190,805.40-80,922.56

Finding the Fourth Proportional to 138,301.28, 190,805.40 and 80,922.56

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Solution

The fourth proportional to 138,301.28, 190,805.40 and 80,922.56 is: 111,643.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,301.28 : 190,805.40 = 80,922.56 : x
  2. Step 2: Convert to fraction form
    138,301.28/190,805.40 = 80,922.56/x
  3. Step 3: Cross multiply
    138,301.28x = 190,805.40 × 80,922.56
  4. Step 4: Simplify right side
    138,301.28x = 15,440,461,429.82
  5. Step 5: Solve for x
    x = 15,440,461,429.82/138,301.28
  6. Step 6: Final answer
    x = 111,643.66

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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.