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Finding the Fourth Proportional to 1,938, 2,908.28 and 912.08

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Solution

The fourth proportional to 1,938, 2,908.28 and 912.08 is: 1,368.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938 : 2,908.28 = 912.08 : x
  2. Step 2: Convert to fraction form
    1,938/2,908.28 = 912.08/x
  3. Step 3: Cross multiply
    1,938x = 2,908.28 × 912.08
  4. Step 4: Simplify right side
    1,938x = 2,652,584.02
  5. Step 5: Solve for x
    x = 2,652,584.02/1,938
  6. Step 6: Final answer
    x = 1,368.72

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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.