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Finding the Fourth Proportional to 45,978.79, 68,972.13 and 12,698.85

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Solution

The fourth proportional to 45,978.79, 68,972.13 and 12,698.85 is: 19,049.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,978.79 : 68,972.13 = 12,698.85 : x
  2. Step 2: Convert to fraction form
    45,978.79/68,972.13 = 12,698.85/x
  3. Step 3: Cross multiply
    45,978.79x = 68,972.13 × 12,698.85
  4. Step 4: Simplify right side
    45,978.79x = 875,866,833.43
  5. Step 5: Solve for x
    x = 875,866,833.43/45,978.79
  6. Step 6: Final answer
    x = 19,049.37

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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.