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Finding the Fourth Proportional to 817.16, 1,230.59 and 744.80

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Solution

The fourth proportional to 817.16, 1,230.59 and 744.80 is: 1,121.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.16 : 1,230.59 = 744.80 : x
  2. Step 2: Convert to fraction form
    817.16/1,230.59 = 744.80/x
  3. Step 3: Cross multiply
    817.16x = 1,230.59 × 744.80
  4. Step 4: Simplify right side
    817.16x = 916,539.14
  5. Step 5: Solve for x
    x = 916,539.14/817.16
  6. Step 6: Final answer
    x = 1,121.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.