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Finding the Fourth Proportional to 1,119.90, 1,679.84 and 389.48

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Solution

The fourth proportional to 1,119.90, 1,679.84 and 389.48 is: 584.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.90 : 1,679.84 = 389.48 : x
  2. Step 2: Convert to fraction form
    1,119.90/1,679.84 = 389.48/x
  3. Step 3: Cross multiply
    1,119.90x = 1,679.84 × 389.48
  4. Step 4: Simplify right side
    1,119.90x = 654,253.74
  5. Step 5: Solve for x
    x = 654,253.74/1,119.90
  6. Step 6: Final answer
    x = 584.21

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Double scale
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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.