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Finding the Fourth Proportional to 403.76, 556.78 and 320.60

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Solution

The fourth proportional to 403.76, 556.78 and 320.60 is: 442.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.76 : 556.78 = 320.60 : x
  2. Step 2: Convert to fraction form
    403.76/556.78 = 320.60/x
  3. Step 3: Cross multiply
    403.76x = 556.78 × 320.60
  4. Step 4: Simplify right side
    403.76x = 178,503.67
  5. Step 5: Solve for x
    x = 178,503.67/403.76
  6. Step 6: Final answer
    x = 442.10

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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.