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Finding the Fourth Proportional to 39,978.23, 59,956.89 and 11,890.72

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Solution

The fourth proportional to 39,978.23, 59,956.89 and 11,890.72 is: 17,832.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.23 : 59,956.89 = 11,890.72 : x
  2. Step 2: Convert to fraction form
    39,978.23/59,956.89 = 11,890.72/x
  3. Step 3: Cross multiply
    39,978.23x = 59,956.89 × 11,890.72
  4. Step 4: Simplify right side
    39,978.23x = 712,930,591.06
  5. Step 5: Solve for x
    x = 712,930,591.06/39,978.23
  6. Step 6: Final answer
    x = 17,832.97

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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.