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Finding the Fourth Proportional to 1,085.67, 1,627.22 and 391.97

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Solution

The fourth proportional to 1,085.67, 1,627.22 and 391.97 is: 587.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.67 : 1,627.22 = 391.97 : x
  2. Step 2: Convert to fraction form
    1,085.67/1,627.22 = 391.97/x
  3. Step 3: Cross multiply
    1,085.67x = 1,627.22 × 391.97
  4. Step 4: Simplify right side
    1,085.67x = 637,826.47
  5. Step 5: Solve for x
    x = 637,826.47/1,085.67
  6. Step 6: Final answer
    x = 587.50

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.