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Finding the Fourth Proportional to 12,647.92, 18,964.20 and 6,488.56

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Solution

The fourth proportional to 12,647.92, 18,964.20 and 6,488.56 is: 9,728.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,647.92 : 18,964.20 = 6,488.56 : x
  2. Step 2: Convert to fraction form
    12,647.92/18,964.20 = 6,488.56/x
  3. Step 3: Cross multiply
    12,647.92x = 18,964.20 × 6,488.56
  4. Step 4: Simplify right side
    12,647.92x = 123,050,349.55
  5. Step 5: Solve for x
    x = 123,050,349.55/12,647.92
  6. Step 6: Final answer
    x = 9,728.90

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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.