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Finding the Fourth Proportional to 811.19, 1,216.60 and 349.19

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Solution

The fourth proportional to 811.19, 1,216.60 and 349.19 is: 523.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.19 : 1,216.60 = 349.19 : x
  2. Step 2: Convert to fraction form
    811.19/1,216.60 = 349.19/x
  3. Step 3: Cross multiply
    811.19x = 1,216.60 × 349.19
  4. Step 4: Simplify right side
    811.19x = 424,820.70
  5. Step 5: Solve for x
    x = 424,820.70/811.19
  6. Step 6: Final answer
    x = 523.70

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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.