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Finding the Fourth Proportional to 101,139.70, 151,709.55 and 81,456.70

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Solution

The fourth proportional to 101,139.70, 151,709.55 and 81,456.70 is: 122,185.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,139.70 : 151,709.55 = 81,456.70 : x
  2. Step 2: Convert to fraction form
    101,139.70/151,709.55 = 81,456.70/x
  3. Step 3: Cross multiply
    101,139.70x = 151,709.55 × 81,456.70
  4. Step 4: Simplify right side
    101,139.70x = 12,357,759,301.49
  5. Step 5: Solve for x
    x = 12,357,759,301.49/101,139.70
  6. Step 6: Final answer
    x = 122,185.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.