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Finding the Fourth Proportional to 811.88, 1,216.90 and 348.98

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Solution

The fourth proportional to 811.88, 1,216.90 and 348.98 is: 523.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.88 : 1,216.90 = 348.98 : x
  2. Step 2: Convert to fraction form
    811.88/1,216.90 = 348.98/x
  3. Step 3: Cross multiply
    811.88x = 1,216.90 × 348.98
  4. Step 4: Simplify right side
    811.88x = 424,673.76
  5. Step 5: Solve for x
    x = 424,673.76/811.88
  6. Step 6: Final answer
    x = 523.07

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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.