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Finding the Fourth Proportional to 1,119.83, 1,679.70 and 389.47

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Solution

The fourth proportional to 1,119.83, 1,679.70 and 389.47 is: 584.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.83 : 1,679.70 = 389.47 : x
  2. Step 2: Convert to fraction form
    1,119.83/1,679.70 = 389.47/x
  3. Step 3: Cross multiply
    1,119.83x = 1,679.70 × 389.47
  4. Step 4: Simplify right side
    1,119.83x = 654,182.41
  5. Step 5: Solve for x
    x = 654,182.41/1,119.83
  6. Step 6: Final answer
    x = 584.18

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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.