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Finding the Fourth Proportional to 403.59, 556.60 and 320.56

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Solution

The fourth proportional to 403.59, 556.60 and 320.56 is: 442.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.59 : 556.60 = 320.56 : x
  2. Step 2: Convert to fraction form
    403.59/556.60 = 320.56/x
  3. Step 3: Cross multiply
    403.59x = 556.60 × 320.56
  4. Step 4: Simplify right side
    403.59x = 178,423.70
  5. Step 5: Solve for x
    x = 178,423.70/403.59
  6. Step 6: Final answer
    x = 442.09

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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.