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Finding the Fourth Proportional to 436.80, 655.55 and 321.56

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Solution

The fourth proportional to 436.80, 655.55 and 321.56 is: 482.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.80 : 655.55 = 321.56 : x
  2. Step 2: Convert to fraction form
    436.80/655.55 = 321.56/x
  3. Step 3: Cross multiply
    436.80x = 655.55 × 321.56
  4. Step 4: Simplify right side
    436.80x = 210,798.66
  5. Step 5: Solve for x
    x = 210,798.66/436.80
  6. Step 6: Final answer
    x = 482.60

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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.