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Finding the Fourth Proportional to 811.42, 1,214.94 and 425.86

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Solution

The fourth proportional to 811.42, 1,214.94 and 425.86 is: 637.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.42 : 1,214.94 = 425.86 : x
  2. Step 2: Convert to fraction form
    811.42/1,214.94 = 425.86/x
  3. Step 3: Cross multiply
    811.42x = 1,214.94 × 425.86
  4. Step 4: Simplify right side
    811.42x = 517,394.35
  5. Step 5: Solve for x
    x = 517,394.35/811.42
  6. Step 6: Final answer
    x = 637.64

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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.