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Finding the Fourth Proportional to 667.02, 920.55 and 490.56

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Solution

The fourth proportional to 667.02, 920.55 and 490.56 is: 677.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.02 : 920.55 = 490.56 : x
  2. Step 2: Convert to fraction form
    667.02/920.55 = 490.56/x
  3. Step 3: Cross multiply
    667.02x = 920.55 × 490.56
  4. Step 4: Simplify right side
    667.02x = 451,585.01
  5. Step 5: Solve for x
    x = 451,585.01/667.02
  6. Step 6: Final answer
    x = 677.02

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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.