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Finding the Fourth Proportional to 811.61, 1,217.41 and 348.73

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Solution

The fourth proportional to 811.61, 1,217.41 and 348.73 is: 523.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.61 : 1,217.41 = 348.73 : x
  2. Step 2: Convert to fraction form
    811.61/1,217.41 = 348.73/x
  3. Step 3: Cross multiply
    811.61x = 1,217.41 × 348.73
  4. Step 4: Simplify right side
    811.61x = 424,547.39
  5. Step 5: Solve for x
    x = 424,547.39/811.61
  6. Step 6: Final answer
    x = 523.09

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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.