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Finding the Fourth Proportional to 817.86, 1,227.36 and 427.98

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Solution

The fourth proportional to 817.86, 1,227.36 and 427.98 is: 642.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.86 : 1,227.36 = 427.98 : x
  2. Step 2: Convert to fraction form
    817.86/1,227.36 = 427.98/x
  3. Step 3: Cross multiply
    817.86x = 1,227.36 × 427.98
  4. Step 4: Simplify right side
    817.86x = 525,285.53
  5. Step 5: Solve for x
    x = 525,285.53/817.86
  6. Step 6: Final answer
    x = 642.27

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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.