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Finding the Fourth Proportional to 2,145.44, 3,219.38 and 912.72

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Solution

The fourth proportional to 2,145.44, 3,219.38 and 912.72 is: 1,369.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.44 : 3,219.38 = 912.72 : x
  2. Step 2: Convert to fraction form
    2,145.44/3,219.38 = 912.72/x
  3. Step 3: Cross multiply
    2,145.44x = 3,219.38 × 912.72
  4. Step 4: Simplify right side
    2,145.44x = 2,938,387.95
  5. Step 5: Solve for x
    x = 2,938,387.95/2,145.44
  6. Step 6: Final answer
    x = 1,369.60

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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.