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Finding the Fourth Proportional to 940.21, 1,297.55 and 608.38

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Solution

The fourth proportional to 940.21, 1,297.55 and 608.38 is: 839.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.21 : 1,297.55 = 608.38 : x
  2. Step 2: Convert to fraction form
    940.21/1,297.55 = 608.38/x
  3. Step 3: Cross multiply
    940.21x = 1,297.55 × 608.38
  4. Step 4: Simplify right side
    940.21x = 789,401.75
  5. Step 5: Solve for x
    x = 789,401.75/940.21
  6. Step 6: Final answer
    x = 839.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.