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Finding the Fourth Proportional to 1,119.93, 1,679.89 and 388.99

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Solution

The fourth proportional to 1,119.93, 1,679.89 and 388.99 is: 583.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.93 : 1,679.89 = 388.99 : x
  2. Step 2: Convert to fraction form
    1,119.93/1,679.89 = 388.99/x
  3. Step 3: Cross multiply
    1,119.93x = 1,679.89 × 388.99
  4. Step 4: Simplify right side
    1,119.93x = 653,451.04
  5. Step 5: Solve for x
    x = 653,451.04/1,119.93
  6. Step 6: Final answer
    x = 583.48

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.