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Finding the Fourth Proportional to 1,684.36, 2,524.78 and 1,221

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Solution

The fourth proportional to 1,684.36, 2,524.78 and 1,221 is: 1,830.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,684.36 : 2,524.78 = 1,221 : x
  2. Step 2: Convert to fraction form
    1,684.36/2,524.78 = 1,221/x
  3. Step 3: Cross multiply
    1,684.36x = 2,524.78 × 1,221
  4. Step 4: Simplify right side
    1,684.36x = 3,082,756.38
  5. Step 5: Solve for x
    x = 3,082,756.38/1,684.36
  6. Step 6: Final answer
    x = 1,830.22

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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.