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Finding the Fourth Proportional to 18,671.58, 28,005.21 and 4,821.66

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Solution

The fourth proportional to 18,671.58, 28,005.21 and 4,821.66 is: 7,231.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,671.58 : 28,005.21 = 4,821.66 : x
  2. Step 2: Convert to fraction form
    18,671.58/28,005.21 = 4,821.66/x
  3. Step 3: Cross multiply
    18,671.58x = 28,005.21 × 4,821.66
  4. Step 4: Simplify right side
    18,671.58x = 135,031,600.85
  5. Step 5: Solve for x
    x = 135,031,600.85/18,671.58
  6. Step 6: Final answer
    x = 7,231.93

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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.