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Finding the Fourth Proportional to 67,139.80, 100,623.30 and 51,479.80

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Solution

The fourth proportional to 67,139.80, 100,623.30 and 51,479.80 is: 77,153.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,139.80 : 100,623.30 = 51,479.80 : x
  2. Step 2: Convert to fraction form
    67,139.80/100,623.30 = 51,479.80/x
  3. Step 3: Cross multiply
    67,139.80x = 100,623.30 × 51,479.80
  4. Step 4: Simplify right side
    67,139.80x = 5,180,067,359.34
  5. Step 5: Solve for x
    x = 5,180,067,359.34/67,139.80
  6. Step 6: Final answer
    x = 77,153.45

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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.