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Finding the Fourth Proportional to 39,978.59, 59,963.58 and 21,238.70

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Solution

The fourth proportional to 39,978.59, 59,963.58 and 21,238.70 is: 31,855.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.59 : 59,963.58 = 21,238.70 : x
  2. Step 2: Convert to fraction form
    39,978.59/59,963.58 = 21,238.70/x
  3. Step 3: Cross multiply
    39,978.59x = 59,963.58 × 21,238.70
  4. Step 4: Simplify right side
    39,978.59x = 1,273,548,186.73
  5. Step 5: Solve for x
    x = 1,273,548,186.73/39,978.59
  6. Step 6: Final answer
    x = 31,855.76

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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.