Home / 138,533.97-191,165.36-78,119.51

Finding the Fourth Proportional to 138,533.97, 191,165.36 and 78,119.51

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Solution

The fourth proportional to 138,533.97, 191,165.36 and 78,119.51 is: 107,798.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,533.97 : 191,165.36 = 78,119.51 : x
  2. Step 2: Convert to fraction form
    138,533.97/191,165.36 = 78,119.51/x
  3. Step 3: Cross multiply
    138,533.97x = 191,165.36 × 78,119.51
  4. Step 4: Simplify right side
    138,533.97x = 14,933,744,339.49
  5. Step 5: Solve for x
    x = 14,933,744,339.49/138,533.97
  6. Step 6: Final answer
    x = 107,798.43

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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.