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Finding the Fourth Proportional to 1,121.16, 1,682.04 and 390.54

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Solution

The fourth proportional to 1,121.16, 1,682.04 and 390.54 is: 585.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.16 : 1,682.04 = 390.54 : x
  2. Step 2: Convert to fraction form
    1,121.16/1,682.04 = 390.54/x
  3. Step 3: Cross multiply
    1,121.16x = 1,682.04 × 390.54
  4. Step 4: Simplify right side
    1,121.16x = 656,903.90
  5. Step 5: Solve for x
    x = 656,903.90/1,121.16
  6. Step 6: Final answer
    x = 585.91

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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.