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Finding the Fourth Proportional to 2,913.75, 4,369.60 and 939.30

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Solution

The fourth proportional to 2,913.75, 4,369.60 and 939.30 is: 1,408.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,913.75 : 4,369.60 = 939.30 : x
  2. Step 2: Convert to fraction form
    2,913.75/4,369.60 = 939.30/x
  3. Step 3: Cross multiply
    2,913.75x = 4,369.60 × 939.30
  4. Step 4: Simplify right side
    2,913.75x = 4,104,360.58
  5. Step 5: Solve for x
    x = 4,104,360.58/2,913.75
  6. Step 6: Final answer
    x = 1,408.62

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1.5x scale

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.