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Finding the Fourth Proportional to 18,979, 28,468.50 and 5,128

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Solution

The fourth proportional to 18,979, 28,468.50 and 5,128 is: 7,692

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979 : 28,468.50 = 5,128 : x
  2. Step 2: Convert to fraction form
    18,979/28,468.50 = 5,128/x
  3. Step 3: Cross multiply
    18,979x = 28,468.50 × 5,128
  4. Step 4: Simplify right side
    18,979x = 145,986,468
  5. Step 5: Solve for x
    x = 145,986,468/18,979
  6. Step 6: Final answer
    x = 7,692

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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.