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Finding the Fourth Proportional to 20,717.64, 30,928.77 and 19,988.64

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Solution

The fourth proportional to 20,717.64, 30,928.77 and 19,988.64 is: 29,840.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,717.64 : 30,928.77 = 19,988.64 : x
  2. Step 2: Convert to fraction form
    20,717.64/30,928.77 = 19,988.64/x
  3. Step 3: Cross multiply
    20,717.64x = 30,928.77 × 19,988.64
  4. Step 4: Simplify right side
    20,717.64x = 618,224,049.17
  5. Step 5: Solve for x
    x = 618,224,049.17/20,717.64
  6. Step 6: Final answer
    x = 29,840.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.