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Finding the Fourth Proportional to 940.45, 1,297.68 and 520.75

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Solution

The fourth proportional to 940.45, 1,297.68 and 520.75 is: 718.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.45 : 1,297.68 = 520.75 : x
  2. Step 2: Convert to fraction form
    940.45/1,297.68 = 520.75/x
  3. Step 3: Cross multiply
    940.45x = 1,297.68 × 520.75
  4. Step 4: Simplify right side
    940.45x = 675,766.86
  5. Step 5: Solve for x
    x = 675,766.86/940.45
  6. Step 6: Final answer
    x = 718.56

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Double scale
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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.