Home / 138,178.60-190,686.11-77,749.36

Finding the Fourth Proportional to 138,178.60, 190,686.11 and 77,749.36

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Solution

The fourth proportional to 138,178.60, 190,686.11 and 77,749.36 is: 107,293.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,178.60 : 190,686.11 = 77,749.36 : x
  2. Step 2: Convert to fraction form
    138,178.60/190,686.11 = 77,749.36/x
  3. Step 3: Cross multiply
    138,178.60x = 190,686.11 × 77,749.36
  4. Step 4: Simplify right side
    138,178.60x = 14,825,723,013.39
  5. Step 5: Solve for x
    x = 14,825,723,013.39/138,178.60
  6. Step 6: Final answer
    x = 107,293.92

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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.