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Finding the Fourth Proportional to 127,485.90, 191,029.05 and 80,639.82

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Solution

The fourth proportional to 127,485.90, 191,029.05 and 80,639.82 is: 120,833.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,485.90 : 191,029.05 = 80,639.82 : x
  2. Step 2: Convert to fraction form
    127,485.90/191,029.05 = 80,639.82/x
  3. Step 3: Cross multiply
    127,485.90x = 191,029.05 × 80,639.82
  4. Step 4: Simplify right side
    127,485.90x = 15,404,548,206.77
  5. Step 5: Solve for x
    x = 15,404,548,206.77/127,485.90
  6. Step 6: Final answer
    x = 120,833.35

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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.