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Finding the Fourth Proportional to 39,879.64, 59,808.54 and 11,791.30

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Solution

The fourth proportional to 39,879.64, 59,808.54 and 11,791.30 is: 17,683.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,879.64 : 59,808.54 = 11,791.30 : x
  2. Step 2: Convert to fraction form
    39,879.64/59,808.54 = 11,791.30/x
  3. Step 3: Cross multiply
    39,879.64x = 59,808.54 × 11,791.30
  4. Step 4: Simplify right side
    39,879.64x = 705,220,437.70
  5. Step 5: Solve for x
    x = 705,220,437.70/39,879.64
  6. Step 6: Final answer
    x = 17,683.72

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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.