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Finding the Fourth Proportional to 940.70, 1,408.80 and 506.90

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Solution

The fourth proportional to 940.70, 1,408.80 and 506.90 is: 759.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.70 : 1,408.80 = 506.90 : x
  2. Step 2: Convert to fraction form
    940.70/1,408.80 = 506.90/x
  3. Step 3: Cross multiply
    940.70x = 1,408.80 × 506.90
  4. Step 4: Simplify right side
    940.70x = 714,120.72
  5. Step 5: Solve for x
    x = 714,120.72/940.70
  6. Step 6: Final answer
    x = 759.14

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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.