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Finding the Fourth Proportional to 18,890.40, 28,335.60 and 8,522.40

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Solution

The fourth proportional to 18,890.40, 28,335.60 and 8,522.40 is: 12,783.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,890.40 : 28,335.60 = 8,522.40 : x
  2. Step 2: Convert to fraction form
    18,890.40/28,335.60 = 8,522.40/x
  3. Step 3: Cross multiply
    18,890.40x = 28,335.60 × 8,522.40
  4. Step 4: Simplify right side
    18,890.40x = 241,487,317.44
  5. Step 5: Solve for x
    x = 241,487,317.44/18,890.40
  6. Step 6: Final answer
    x = 12,783.60

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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.