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Finding the Fourth Proportional to 12,990.70, 19,488.10 and 4,223.57

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Solution

The fourth proportional to 12,990.70, 19,488.10 and 4,223.57 is: 6,336.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.70 : 19,488.10 = 4,223.57 : x
  2. Step 2: Convert to fraction form
    12,990.70/19,488.10 = 4,223.57/x
  3. Step 3: Cross multiply
    12,990.70x = 19,488.10 × 4,223.57
  4. Step 4: Simplify right side
    12,990.70x = 82,309,257.08
  5. Step 5: Solve for x
    x = 82,309,257.08/12,990.70
  6. Step 6: Final answer
    x = 6,336.01

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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.