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Finding the Fourth Proportional to 8,639.84, 12,942.55 and 6,658.55

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Solution

The fourth proportional to 8,639.84, 12,942.55 and 6,658.55 is: 9,974.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.84 : 12,942.55 = 6,658.55 : x
  2. Step 2: Convert to fraction form
    8,639.84/12,942.55 = 6,658.55/x
  3. Step 3: Cross multiply
    8,639.84x = 12,942.55 × 6,658.55
  4. Step 4: Simplify right side
    8,639.84x = 86,178,616.30
  5. Step 5: Solve for x
    x = 86,178,616.30/8,639.84
  6. Step 6: Final answer
    x = 9,974.56

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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.