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Finding the Fourth Proportional to 828.01, 1,241.20 and 612.55

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Solution

The fourth proportional to 828.01, 1,241.20 and 612.55 is: 918.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.01 : 1,241.20 = 612.55 : x
  2. Step 2: Convert to fraction form
    828.01/1,241.20 = 612.55/x
  3. Step 3: Cross multiply
    828.01x = 1,241.20 × 612.55
  4. Step 4: Simplify right side
    828.01x = 760,297.06
  5. Step 5: Solve for x
    x = 760,297.06/828.01
  6. Step 6: Final answer
    x = 918.22

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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.