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Finding the Fourth Proportional to 1,385.16, 1,912.02 and 919.56

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Solution

The fourth proportional to 1,385.16, 1,912.02 and 919.56 is: 1,269.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.16 : 1,912.02 = 919.56 : x
  2. Step 2: Convert to fraction form
    1,385.16/1,912.02 = 919.56/x
  3. Step 3: Cross multiply
    1,385.16x = 1,912.02 × 919.56
  4. Step 4: Simplify right side
    1,385.16x = 1,758,217.11
  5. Step 5: Solve for x
    x = 1,758,217.11/1,385.16
  6. Step 6: Final answer
    x = 1,269.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.