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Finding the Fourth Proportional to 2,145.49, 3,218.89 and 912.87

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Solution

The fourth proportional to 2,145.49, 3,218.89 and 912.87 is: 1,369.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.49 : 3,218.89 = 912.87 : x
  2. Step 2: Convert to fraction form
    2,145.49/3,218.89 = 912.87/x
  3. Step 3: Cross multiply
    2,145.49x = 3,218.89 × 912.87
  4. Step 4: Simplify right side
    2,145.49x = 2,938,428.11
  5. Step 5: Solve for x
    x = 2,938,428.11/2,145.49
  6. Step 6: Final answer
    x = 1,369.58

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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.