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Finding the Fourth Proportional to 1,120.48, 1,679.50 and 389.66

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Solution

The fourth proportional to 1,120.48, 1,679.50 and 389.66 is: 584.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.48 : 1,679.50 = 389.66 : x
  2. Step 2: Convert to fraction form
    1,120.48/1,679.50 = 389.66/x
  3. Step 3: Cross multiply
    1,120.48x = 1,679.50 × 389.66
  4. Step 4: Simplify right side
    1,120.48x = 654,433.97
  5. Step 5: Solve for x
    x = 654,433.97/1,120.48
  6. Step 6: Final answer
    x = 584.07

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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.