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Finding the Fourth Proportional to 138,249.84, 190,782.60 and 77,820.32

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Solution

The fourth proportional to 138,249.84, 190,782.60 and 77,820.32 is: 107,390.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,249.84 : 190,782.60 = 77,820.32 : x
  2. Step 2: Convert to fraction form
    138,249.84/190,782.60 = 77,820.32/x
  3. Step 3: Cross multiply
    138,249.84x = 190,782.60 × 77,820.32
  4. Step 4: Simplify right side
    138,249.84x = 14,846,762,982.43
  5. Step 5: Solve for x
    x = 14,846,762,982.43/138,249.84
  6. Step 6: Final answer
    x = 107,390.81

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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.