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Finding the Fourth Proportional to 1,383.19, 1,908.75 and 793.78

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Solution

The fourth proportional to 1,383.19, 1,908.75 and 793.78 is: 1,095.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.19 : 1,908.75 = 793.78 : x
  2. Step 2: Convert to fraction form
    1,383.19/1,908.75 = 793.78/x
  3. Step 3: Cross multiply
    1,383.19x = 1,908.75 × 793.78
  4. Step 4: Simplify right side
    1,383.19x = 1,515,127.58
  5. Step 5: Solve for x
    x = 1,515,127.58/1,383.19
  6. Step 6: Final answer
    x = 1,095.39

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Half scale
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Double scale
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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.