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Finding the Fourth Proportional to 403.55, 556.58 and 256.22

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Solution

The fourth proportional to 403.55, 556.58 and 256.22 is: 353.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.55 : 556.58 = 256.22 : x
  2. Step 2: Convert to fraction form
    403.55/556.58 = 256.22/x
  3. Step 3: Cross multiply
    403.55x = 556.58 × 256.22
  4. Step 4: Simplify right side
    403.55x = 142,605.65
  5. Step 5: Solve for x
    x = 142,605.65/403.55
  6. Step 6: Final answer
    x = 353.38

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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.