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Finding the Fourth Proportional to 1,084.05, 1,626.21 and 390.57

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Solution

The fourth proportional to 1,084.05, 1,626.21 and 390.57 is: 585.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,084.05 : 1,626.21 = 390.57 : x
  2. Step 2: Convert to fraction form
    1,084.05/1,626.21 = 390.57/x
  3. Step 3: Cross multiply
    1,084.05x = 1,626.21 × 390.57
  4. Step 4: Simplify right side
    1,084.05x = 635,148.84
  5. Step 5: Solve for x
    x = 635,148.84/1,084.05
  6. Step 6: Final answer
    x = 585.90

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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.