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Finding the Fourth Proportional to 1,213.90, 1,820.28 and 348.04

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Solution

The fourth proportional to 1,213.90, 1,820.28 and 348.04 is: 521.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.90 : 1,820.28 = 348.04 : x
  2. Step 2: Convert to fraction form
    1,213.90/1,820.28 = 348.04/x
  3. Step 3: Cross multiply
    1,213.90x = 1,820.28 × 348.04
  4. Step 4: Simplify right side
    1,213.90x = 633,530.25
  5. Step 5: Solve for x
    x = 633,530.25/1,213.90
  6. Step 6: Final answer
    x = 521.90

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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.