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Finding the Fourth Proportional to 2,938.79, 4,408.83 and 990.94

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Solution

The fourth proportional to 2,938.79, 4,408.83 and 990.94 is: 1,486.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.79 : 4,408.83 = 990.94 : x
  2. Step 2: Convert to fraction form
    2,938.79/4,408.83 = 990.94/x
  3. Step 3: Cross multiply
    2,938.79x = 4,408.83 × 990.94
  4. Step 4: Simplify right side
    2,938.79x = 4,368,886.00
  5. Step 5: Solve for x
    x = 4,368,886.00/2,938.79
  6. Step 6: Final answer
    x = 1,486.63

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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.