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Finding the Fourth Proportional to 18,690, 28,035.72 and 6,378

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Solution

The fourth proportional to 18,690, 28,035.72 and 6,378 is: 9,567.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690 : 28,035.72 = 6,378 : x
  2. Step 2: Convert to fraction form
    18,690/28,035.72 = 6,378/x
  3. Step 3: Cross multiply
    18,690x = 28,035.72 × 6,378
  4. Step 4: Simplify right side
    18,690x = 178,811,822.16
  5. Step 5: Solve for x
    x = 178,811,822.16/18,690
  6. Step 6: Final answer
    x = 9,567.25

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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.