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Finding the Fourth Proportional to 940.42, 1,408.78 and 614.80

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Solution

The fourth proportional to 940.42, 1,408.78 and 614.80 is: 920.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.42 : 1,408.78 = 614.80 : x
  2. Step 2: Convert to fraction form
    940.42/1,408.78 = 614.80/x
  3. Step 3: Cross multiply
    940.42x = 1,408.78 × 614.80
  4. Step 4: Simplify right side
    940.42x = 866,117.94
  5. Step 5: Solve for x
    x = 866,117.94/940.42
  6. Step 6: Final answer
    x = 920.99

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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.