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Finding the Fourth Proportional to 8,916.40, 13,379.40 and 3,722.80

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Solution

The fourth proportional to 8,916.40, 13,379.40 and 3,722.80 is: 5,586.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,916.40 : 13,379.40 = 3,722.80 : x
  2. Step 2: Convert to fraction form
    8,916.40/13,379.40 = 3,722.80/x
  3. Step 3: Cross multiply
    8,916.40x = 13,379.40 × 3,722.80
  4. Step 4: Simplify right side
    8,916.40x = 49,808,830.32
  5. Step 5: Solve for x
    x = 49,808,830.32/8,916.40
  6. Step 6: Final answer
    x = 5,586.20

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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.