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Finding the Fourth Proportional to 1,393.80, 1,923.85 and 804.75

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Solution

The fourth proportional to 1,393.80, 1,923.85 and 804.75 is: 1,110.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.80 : 1,923.85 = 804.75 : x
  2. Step 2: Convert to fraction form
    1,393.80/1,923.85 = 804.75/x
  3. Step 3: Cross multiply
    1,393.80x = 1,923.85 × 804.75
  4. Step 4: Simplify right side
    1,393.80x = 1,548,218.29
  5. Step 5: Solve for x
    x = 1,548,218.29/1,393.80
  6. Step 6: Final answer
    x = 1,110.79

Related Problems

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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.