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Finding the Fourth Proportional to 127,964.80, 191,702.40 and 68,780.80

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Solution

The fourth proportional to 127,964.80, 191,702.40 and 68,780.80 is: 103,039.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,964.80 : 191,702.40 = 68,780.80 : x
  2. Step 2: Convert to fraction form
    127,964.80/191,702.40 = 68,780.80/x
  3. Step 3: Cross multiply
    127,964.80x = 191,702.40 × 68,780.80
  4. Step 4: Simplify right side
    127,964.80x = 13,185,444,433.92
  5. Step 5: Solve for x
    x = 13,185,444,433.92/127,964.80
  6. Step 6: Final answer
    x = 103,039.62

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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.