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Finding the Fourth Proportional to 1,213.80, 1,821 and 348.18

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Solution

The fourth proportional to 1,213.80, 1,821 and 348.18 is: 522.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.80 : 1,821 = 348.18 : x
  2. Step 2: Convert to fraction form
    1,213.80/1,821 = 348.18/x
  3. Step 3: Cross multiply
    1,213.80x = 1,821 × 348.18
  4. Step 4: Simplify right side
    1,213.80x = 634,035.78
  5. Step 5: Solve for x
    x = 634,035.78/1,213.80
  6. Step 6: Final answer
    x = 522.36

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Double scale
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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.