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Finding the Fourth Proportional to 39,978.48, 59,957.27 and 11,890.97

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Solution

The fourth proportional to 39,978.48, 59,957.27 and 11,890.97 is: 17,833.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.48 : 59,957.27 = 11,890.97 : x
  2. Step 2: Convert to fraction form
    39,978.48/59,957.27 = 11,890.97/x
  3. Step 3: Cross multiply
    39,978.48x = 59,957.27 × 11,890.97
  4. Step 4: Simplify right side
    39,978.48x = 712,950,039.40
  5. Step 5: Solve for x
    x = 712,950,039.40/39,978.48
  6. Step 6: Final answer
    x = 17,833.35

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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.