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Finding the Fourth Proportional to 8,638.62, 12,928.74 and 5,354.48

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Solution

The fourth proportional to 8,638.62, 12,928.74 and 5,354.48 is: 8,013.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.62 : 12,928.74 = 5,354.48 : x
  2. Step 2: Convert to fraction form
    8,638.62/12,928.74 = 5,354.48/x
  3. Step 3: Cross multiply
    8,638.62x = 12,928.74 × 5,354.48
  4. Step 4: Simplify right side
    8,638.62x = 69,226,679.76
  5. Step 5: Solve for x
    x = 69,226,679.76/8,638.62
  6. Step 6: Final answer
    x = 8,013.63

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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.