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Finding the Fourth Proportional to 8,212.19, 11,388.80 and 7,916.94

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Solution

The fourth proportional to 8,212.19, 11,388.80 and 7,916.94 is: 10,979.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,212.19 : 11,388.80 = 7,916.94 : x
  2. Step 2: Convert to fraction form
    8,212.19/11,388.80 = 7,916.94/x
  3. Step 3: Cross multiply
    8,212.19x = 11,388.80 × 7,916.94
  4. Step 4: Simplify right side
    8,212.19x = 90,164,466.06
  5. Step 5: Solve for x
    x = 90,164,466.06/8,212.19
  6. Step 6: Final answer
    x = 10,979.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.