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Finding the Fourth Proportional to 1,353.57, 1,868.28 and 1,213.44

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Solution

The fourth proportional to 1,353.57, 1,868.28 and 1,213.44 is: 1,674.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.57 : 1,868.28 = 1,213.44 : x
  2. Step 2: Convert to fraction form
    1,353.57/1,868.28 = 1,213.44/x
  3. Step 3: Cross multiply
    1,353.57x = 1,868.28 × 1,213.44
  4. Step 4: Simplify right side
    1,353.57x = 2,267,045.68
  5. Step 5: Solve for x
    x = 2,267,045.68/1,353.57
  6. Step 6: Final answer
    x = 1,674.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.