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Finding the Fourth Proportional to 655.80, 906.30 and 490.56

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Solution

The fourth proportional to 655.80, 906.30 and 490.56 is: 677.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.80 : 906.30 = 490.56 : x
  2. Step 2: Convert to fraction form
    655.80/906.30 = 490.56/x
  3. Step 3: Cross multiply
    655.80x = 906.30 × 490.56
  4. Step 4: Simplify right side
    655.80x = 444,594.53
  5. Step 5: Solve for x
    x = 444,594.53/655.80
  6. Step 6: Final answer
    x = 677.94

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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.