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Finding the Fourth Proportional to 1,085.21, 1,627.48 and 391.79

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Solution

The fourth proportional to 1,085.21, 1,627.48 and 391.79 is: 587.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.21 : 1,627.48 = 391.79 : x
  2. Step 2: Convert to fraction form
    1,085.21/1,627.48 = 391.79/x
  3. Step 3: Cross multiply
    1,085.21x = 1,627.48 × 391.79
  4. Step 4: Simplify right side
    1,085.21x = 637,630.39
  5. Step 5: Solve for x
    x = 637,630.39/1,085.21
  6. Step 6: Final answer
    x = 587.56

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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.