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Finding the Fourth Proportional to 811.96, 1,218.15 and 284.86

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Solution

The fourth proportional to 811.96, 1,218.15 and 284.86 is: 427.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.96 : 1,218.15 = 284.86 : x
  2. Step 2: Convert to fraction form
    811.96/1,218.15 = 284.86/x
  3. Step 3: Cross multiply
    811.96x = 1,218.15 × 284.86
  4. Step 4: Simplify right side
    811.96x = 347,002.21
  5. Step 5: Solve for x
    x = 347,002.21/811.96
  6. Step 6: Final answer
    x = 427.36

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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.