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Finding the Fourth Proportional to 1,383.26, 1,908.86 and 785.70

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Solution

The fourth proportional to 1,383.26, 1,908.86 and 785.70 is: 1,084.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.26 : 1,908.86 = 785.70 : x
  2. Step 2: Convert to fraction form
    1,383.26/1,908.86 = 785.70/x
  3. Step 3: Cross multiply
    1,383.26x = 1,908.86 × 785.70
  4. Step 4: Simplify right side
    1,383.26x = 1,499,787.37
  5. Step 5: Solve for x
    x = 1,499,787.37/1,383.26
  6. Step 6: Final answer
    x = 1,084.25

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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.