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Finding the Fourth Proportional to 28,521, 42,798.78 and 12,105

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Solution

The fourth proportional to 28,521, 42,798.78 and 12,105 is: 18,164.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,521 : 42,798.78 = 12,105 : x
  2. Step 2: Convert to fraction form
    28,521/42,798.78 = 12,105/x
  3. Step 3: Cross multiply
    28,521x = 42,798.78 × 12,105
  4. Step 4: Simplify right side
    28,521x = 518,079,231.90
  5. Step 5: Solve for x
    x = 518,079,231.90/28,521
  6. Step 6: Final answer
    x = 18,164.83

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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.