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Finding the Fourth Proportional to 2,938.64, 4,408.39 and 990.18

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Solution

The fourth proportional to 2,938.64, 4,408.39 and 990.18 is: 1,485.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.64 : 4,408.39 = 990.18 : x
  2. Step 2: Convert to fraction form
    2,938.64/4,408.39 = 990.18/x
  3. Step 3: Cross multiply
    2,938.64x = 4,408.39 × 990.18
  4. Step 4: Simplify right side
    2,938.64x = 4,365,099.61
  5. Step 5: Solve for x
    x = 4,365,099.61/2,938.64
  6. Step 6: Final answer
    x = 1,485.41

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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.