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Finding the Fourth Proportional to 18,738, 28,108.62 and 4,887

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Solution

The fourth proportional to 18,738, 28,108.62 and 4,887 is: 7,330.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,738 : 28,108.62 = 4,887 : x
  2. Step 2: Convert to fraction form
    18,738/28,108.62 = 4,887/x
  3. Step 3: Cross multiply
    18,738x = 28,108.62 × 4,887
  4. Step 4: Simplify right side
    18,738x = 137,366,825.94
  5. Step 5: Solve for x
    x = 137,366,825.94/18,738
  6. Step 6: Final answer
    x = 7,330.92

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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.