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Finding the Fourth Proportional to 1,890, 2,832.98 and 913.95

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Solution

The fourth proportional to 1,890, 2,832.98 and 913.95 is: 1,369.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890 : 2,832.98 = 913.95 : x
  2. Step 2: Convert to fraction form
    1,890/2,832.98 = 913.95/x
  3. Step 3: Cross multiply
    1,890x = 2,832.98 × 913.95
  4. Step 4: Simplify right side
    1,890x = 2,589,197.50
  5. Step 5: Solve for x
    x = 2,589,197.50/1,890
  6. Step 6: Final answer
    x = 1,369.95

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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.