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Finding the Fourth Proportional to 935.45, 1,290.21 and 620.15

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Solution

The fourth proportional to 935.45, 1,290.21 and 620.15 is: 855.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.45 : 1,290.21 = 620.15 : x
  2. Step 2: Convert to fraction form
    935.45/1,290.21 = 620.15/x
  3. Step 3: Cross multiply
    935.45x = 1,290.21 × 620.15
  4. Step 4: Simplify right side
    935.45x = 800,123.73
  5. Step 5: Solve for x
    x = 800,123.73/935.45
  6. Step 6: Final answer
    x = 855.34

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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.