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Finding the Fourth Proportional to 20,988, 28,969.55 and 16,768.44

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Solution

The fourth proportional to 20,988, 28,969.55 and 16,768.44 is: 23,145.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988 : 28,969.55 = 16,768.44 : x
  2. Step 2: Convert to fraction form
    20,988/28,969.55 = 16,768.44/x
  3. Step 3: Cross multiply
    20,988x = 28,969.55 × 16,768.44
  4. Step 4: Simplify right side
    20,988x = 485,774,077.16
  5. Step 5: Solve for x
    x = 485,774,077.16/20,988
  6. Step 6: Final answer
    x = 23,145.32

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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.