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Finding the Fourth Proportional to 1,213.39, 1,820.33 and 391.87

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Solution

The fourth proportional to 1,213.39, 1,820.33 and 391.87 is: 587.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.39 : 1,820.33 = 391.87 : x
  2. Step 2: Convert to fraction form
    1,213.39/1,820.33 = 391.87/x
  3. Step 3: Cross multiply
    1,213.39x = 1,820.33 × 391.87
  4. Step 4: Simplify right side
    1,213.39x = 713,330.76
  5. Step 5: Solve for x
    x = 713,330.76/1,213.39
  6. Step 6: Final answer
    x = 587.88

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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.