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Finding the Fourth Proportional to 935.49, 1,290.09 and 620.67

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Solution

The fourth proportional to 935.49, 1,290.09 and 620.67 is: 855.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.49 : 1,290.09 = 620.67 : x
  2. Step 2: Convert to fraction form
    935.49/1,290.09 = 620.67/x
  3. Step 3: Cross multiply
    935.49x = 1,290.09 × 620.67
  4. Step 4: Simplify right side
    935.49x = 800,720.16
  5. Step 5: Solve for x
    x = 800,720.16/935.49
  6. Step 6: Final answer
    x = 855.94

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1.5x scale

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.