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Finding the Fourth Proportional to 18,420.40, 27,630.60 and 8,578.90

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Solution

The fourth proportional to 18,420.40, 27,630.60 and 8,578.90 is: 12,868.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.40 : 27,630.60 = 8,578.90 : x
  2. Step 2: Convert to fraction form
    18,420.40/27,630.60 = 8,578.90/x
  3. Step 3: Cross multiply
    18,420.40x = 27,630.60 × 8,578.90
  4. Step 4: Simplify right side
    18,420.40x = 237,040,154.34
  5. Step 5: Solve for x
    x = 237,040,154.34/18,420.40
  6. Step 6: Final answer
    x = 12,868.35

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1.5x scale

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.