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Finding the Fourth Proportional to 12,991.56, 19,489.06 and 4,223.50

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Solution

The fourth proportional to 12,991.56, 19,489.06 and 4,223.50 is: 6,335.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.56 : 19,489.06 = 4,223.50 : x
  2. Step 2: Convert to fraction form
    12,991.56/19,489.06 = 4,223.50/x
  3. Step 3: Cross multiply
    12,991.56x = 19,489.06 × 4,223.50
  4. Step 4: Simplify right side
    12,991.56x = 82,312,044.91
  5. Step 5: Solve for x
    x = 82,312,044.91/12,991.56
  6. Step 6: Final answer
    x = 6,335.81

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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.