Home / 138,108.22-190,587.45-77,678.84

Finding the Fourth Proportional to 138,108.22, 190,587.45 and 77,678.84

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Solution

The fourth proportional to 138,108.22, 190,587.45 and 77,678.84 is: 107,195.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,108.22 : 190,587.45 = 77,678.84 : x
  2. Step 2: Convert to fraction form
    138,108.22/190,587.45 = 77,678.84/x
  3. Step 3: Cross multiply
    138,108.22x = 190,587.45 × 77,678.84
  4. Step 4: Simplify right side
    138,108.22x = 14,804,612,034.56
  5. Step 5: Solve for x
    x = 14,804,612,034.56/138,108.22
  6. Step 6: Final answer
    x = 107,195.73

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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.