Home / 138,740.01-191,440.69-81,357.68

Finding the Fourth Proportional to 138,740.01, 191,440.69 and 81,357.68

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Solution

The fourth proportional to 138,740.01, 191,440.69 and 81,357.68 is: 112,261.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,740.01 : 191,440.69 = 81,357.68 : x
  2. Step 2: Convert to fraction form
    138,740.01/191,440.69 = 81,357.68/x
  3. Step 3: Cross multiply
    138,740.01x = 191,440.69 × 81,357.68
  4. Step 4: Simplify right side
    138,740.01x = 15,575,170,900.03
  5. Step 5: Solve for x
    x = 15,575,170,900.03/138,740.01
  6. Step 6: Final answer
    x = 112,261.57

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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.