Home / 138,493.56-191,109.06-81,140.70

Finding the Fourth Proportional to 138,493.56, 191,109.06 and 81,140.70

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Solution

The fourth proportional to 138,493.56, 191,109.06 and 81,140.70 is: 111,967.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,493.56 : 191,109.06 = 81,140.70 : x
  2. Step 2: Convert to fraction form
    138,493.56/191,109.06 = 81,140.70/x
  3. Step 3: Cross multiply
    138,493.56x = 191,109.06 × 81,140.70
  4. Step 4: Simplify right side
    138,493.56x = 15,506,722,904.74
  5. Step 5: Solve for x
    x = 15,506,722,904.74/138,493.56
  6. Step 6: Final answer
    x = 111,967.10

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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.