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Finding the Fourth Proportional to 403.90, 556.95 and 319.74

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Solution

The fourth proportional to 403.90, 556.95 and 319.74 is: 440.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.90 : 556.95 = 319.74 : x
  2. Step 2: Convert to fraction form
    403.90/556.95 = 319.74/x
  3. Step 3: Cross multiply
    403.90x = 556.95 × 319.74
  4. Step 4: Simplify right side
    403.90x = 178,076.41
  5. Step 5: Solve for x
    x = 178,076.41/403.90
  6. Step 6: Final answer
    x = 440.90

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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.