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Finding the Fourth Proportional to 128,014.80, 191,935.80 and 68,053.20

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Solution

The fourth proportional to 128,014.80, 191,935.80 and 68,053.20 is: 102,033.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,014.80 : 191,935.80 = 68,053.20 : x
  2. Step 2: Convert to fraction form
    128,014.80/191,935.80 = 68,053.20/x
  3. Step 3: Cross multiply
    128,014.80x = 191,935.80 × 68,053.20
  4. Step 4: Simplify right side
    128,014.80x = 13,061,845,384.56
  5. Step 5: Solve for x
    x = 13,061,845,384.56/128,014.80
  6. Step 6: Final answer
    x = 102,033.87

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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.