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Finding the Fourth Proportional to 18,915, 28,378.26 and 6,603

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Solution

The fourth proportional to 18,915, 28,378.26 and 6,603 is: 9,906.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915 : 28,378.26 = 6,603 : x
  2. Step 2: Convert to fraction form
    18,915/28,378.26 = 6,603/x
  3. Step 3: Cross multiply
    18,915x = 28,378.26 × 6,603
  4. Step 4: Simplify right side
    18,915x = 187,381,650.78
  5. Step 5: Solve for x
    x = 187,381,650.78/18,915
  6. Step 6: Final answer
    x = 9,906.51

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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.