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Finding the Fourth Proportional to 1,385.79, 1,912.19 and 796.35

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Solution

The fourth proportional to 1,385.79, 1,912.19 and 796.35 is: 1,098.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.79 : 1,912.19 = 796.35 : x
  2. Step 2: Convert to fraction form
    1,385.79/1,912.19 = 796.35/x
  3. Step 3: Cross multiply
    1,385.79x = 1,912.19 × 796.35
  4. Step 4: Simplify right side
    1,385.79x = 1,522,772.51
  5. Step 5: Solve for x
    x = 1,522,772.51/1,385.79
  6. Step 6: Final answer
    x = 1,098.85

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1.5x scale

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.