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Finding the Fourth Proportional to 30,876, 42,608.64 and 16,728.48

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Solution

The fourth proportional to 30,876, 42,608.64 and 16,728.48 is: 23,085.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,876 : 42,608.64 = 16,728.48 : x
  2. Step 2: Convert to fraction form
    30,876/42,608.64 = 16,728.48/x
  3. Step 3: Cross multiply
    30,876x = 42,608.64 × 16,728.48
  4. Step 4: Simplify right side
    30,876x = 712,777,782.07
  5. Step 5: Solve for x
    x = 712,777,782.07/30,876
  6. Step 6: Final answer
    x = 23,085.17

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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.