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Finding the Fourth Proportional to 138,791.56, 191,533.30 and 75,129.52

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Solution

The fourth proportional to 138,791.56, 191,533.30 and 75,129.52 is: 103,679.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,791.56 : 191,533.30 = 75,129.52 : x
  2. Step 2: Convert to fraction form
    138,791.56/191,533.30 = 75,129.52/x
  3. Step 3: Cross multiply
    138,791.56x = 191,533.30 × 75,129.52
  4. Step 4: Simplify right side
    138,791.56x = 14,389,804,893.02
  5. Step 5: Solve for x
    x = 14,389,804,893.02/138,791.56
  6. Step 6: Final answer
    x = 103,679.25

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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.