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Finding the Fourth Proportional to 138,656.63, 191,347.20 and 81,297.42

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Solution

The fourth proportional to 138,656.63, 191,347.20 and 81,297.42 is: 112,191.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,656.63 : 191,347.20 = 81,297.42 : x
  2. Step 2: Convert to fraction form
    138,656.63/191,347.20 = 81,297.42/x
  3. Step 3: Cross multiply
    138,656.63x = 191,347.20 × 81,297.42
  4. Step 4: Simplify right side
    138,656.63x = 15,556,033,684.22
  5. Step 5: Solve for x
    x = 15,556,033,684.22/138,656.63
  6. Step 6: Final answer
    x = 112,191.06

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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.