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Finding the Fourth Proportional to 1,085.80, 1,627.74 and 401

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Solution

The fourth proportional to 1,085.80, 1,627.74 and 401 is: 601.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.80 : 1,627.74 = 401 : x
  2. Step 2: Convert to fraction form
    1,085.80/1,627.74 = 401/x
  3. Step 3: Cross multiply
    1,085.80x = 1,627.74 × 401
  4. Step 4: Simplify right side
    1,085.80x = 652,723.74
  5. Step 5: Solve for x
    x = 652,723.74/1,085.80
  6. Step 6: Final answer
    x = 601.15

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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.