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Finding the Fourth Proportional to 811.12, 1,216.68 and 348.52

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Solution

The fourth proportional to 811.12, 1,216.68 and 348.52 is: 522.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.12 : 1,216.68 = 348.52 : x
  2. Step 2: Convert to fraction form
    811.12/1,216.68 = 348.52/x
  3. Step 3: Cross multiply
    811.12x = 1,216.68 × 348.52
  4. Step 4: Simplify right side
    811.12x = 424,037.31
  5. Step 5: Solve for x
    x = 424,037.31/811.12
  6. Step 6: Final answer
    x = 522.78

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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.