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Finding the Fourth Proportional to 28,978.48, 39,989.64 and 17,039.20

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Solution

The fourth proportional to 28,978.48, 39,989.64 and 17,039.20 is: 23,513.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.48 : 39,989.64 = 17,039.20 : x
  2. Step 2: Convert to fraction form
    28,978.48/39,989.64 = 17,039.20/x
  3. Step 3: Cross multiply
    28,978.48x = 39,989.64 × 17,039.20
  4. Step 4: Simplify right side
    28,978.48x = 681,391,473.89
  5. Step 5: Solve for x
    x = 681,391,473.89/28,978.48
  6. Step 6: Final answer
    x = 23,513.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.