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Finding the Fourth Proportional to 18,929.10, 28,389.06 and 8,393.28

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Solution

The fourth proportional to 18,929.10, 28,389.06 and 8,393.28 is: 12,587.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,929.10 : 28,389.06 = 8,393.28 : x
  2. Step 2: Convert to fraction form
    18,929.10/28,389.06 = 8,393.28/x
  3. Step 3: Cross multiply
    18,929.10x = 28,389.06 × 8,393.28
  4. Step 4: Simplify right side
    18,929.10x = 238,277,329.52
  5. Step 5: Solve for x
    x = 238,277,329.52/18,929.10
  6. Step 6: Final answer
    x = 12,587.88

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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.