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Finding the Fourth Proportional to 670.28, 925.40 and 449.56

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Solution

The fourth proportional to 670.28, 925.40 and 449.56 is: 620.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.28 : 925.40 = 449.56 : x
  2. Step 2: Convert to fraction form
    670.28/925.40 = 449.56/x
  3. Step 3: Cross multiply
    670.28x = 925.40 × 449.56
  4. Step 4: Simplify right side
    670.28x = 416,022.82
  5. Step 5: Solve for x
    x = 416,022.82/670.28
  6. Step 6: Final answer
    x = 620.67

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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.