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Finding the Fourth Proportional to 8,638.60, 12,960.60 and 3,643.24

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Solution

The fourth proportional to 8,638.60, 12,960.60 and 3,643.24 is: 5,466.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.60 : 12,960.60 = 3,643.24 : x
  2. Step 2: Convert to fraction form
    8,638.60/12,960.60 = 3,643.24/x
  3. Step 3: Cross multiply
    8,638.60x = 12,960.60 × 3,643.24
  4. Step 4: Simplify right side
    8,638.60x = 47,218,576.34
  5. Step 5: Solve for x
    x = 47,218,576.34/8,638.60
  6. Step 6: Final answer
    x = 5,466.00

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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.