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Finding the Fourth Proportional to 1,120.53, 1,680.14 and 389.81

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Solution

The fourth proportional to 1,120.53, 1,680.14 and 389.81 is: 584.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.53 : 1,680.14 = 389.81 : x
  2. Step 2: Convert to fraction form
    1,120.53/1,680.14 = 389.81/x
  3. Step 3: Cross multiply
    1,120.53x = 1,680.14 × 389.81
  4. Step 4: Simplify right side
    1,120.53x = 654,940.55
  5. Step 5: Solve for x
    x = 654,940.55/1,120.53
  6. Step 6: Final answer
    x = 584.49

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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.