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Finding the Fourth Proportional to 2,136, 3,197.76 and 1,311.72

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Solution

The fourth proportional to 2,136, 3,197.76 and 1,311.72 is: 1,963.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,136 : 3,197.76 = 1,311.72 : x
  2. Step 2: Convert to fraction form
    2,136/3,197.76 = 1,311.72/x
  3. Step 3: Cross multiply
    2,136x = 3,197.76 × 1,311.72
  4. Step 4: Simplify right side
    2,136x = 4,194,565.75
  5. Step 5: Solve for x
    x = 4,194,565.75/2,136
  6. Step 6: Final answer
    x = 1,963.75

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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.