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Finding the Fourth Proportional to 620.16, 927.60 and 455.74

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Solution

The fourth proportional to 620.16, 927.60 and 455.74 is: 681.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.16 : 927.60 = 455.74 : x
  2. Step 2: Convert to fraction form
    620.16/927.60 = 455.74/x
  3. Step 3: Cross multiply
    620.16x = 927.60 × 455.74
  4. Step 4: Simplify right side
    620.16x = 422,744.42
  5. Step 5: Solve for x
    x = 422,744.42/620.16
  6. Step 6: Final answer
    x = 681.67

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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.