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Finding the Fourth Proportional to 3,722.50, 5,583.75 and 986.50

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Solution

The fourth proportional to 3,722.50, 5,583.75 and 986.50 is: 1,479.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,722.50 : 5,583.75 = 986.50 : x
  2. Step 2: Convert to fraction form
    3,722.50/5,583.75 = 986.50/x
  3. Step 3: Cross multiply
    3,722.50x = 5,583.75 × 986.50
  4. Step 4: Simplify right side
    3,722.50x = 5,508,369.38
  5. Step 5: Solve for x
    x = 5,508,369.38/3,722.50
  6. Step 6: Final answer
    x = 1,479.75

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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.