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Finding the Fourth Proportional to 935.19, 1,290.37 and 636.67

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Solution

The fourth proportional to 935.19, 1,290.37 and 636.67 is: 878.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.19 : 1,290.37 = 636.67 : x
  2. Step 2: Convert to fraction form
    935.19/1,290.37 = 636.67/x
  3. Step 3: Cross multiply
    935.19x = 1,290.37 × 636.67
  4. Step 4: Simplify right side
    935.19x = 821,539.87
  5. Step 5: Solve for x
    x = 821,539.87/935.19
  6. Step 6: Final answer
    x = 878.47

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.