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Finding the Fourth Proportional to 319.63, 475.61 and 318.55

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Solution

The fourth proportional to 319.63, 475.61 and 318.55 is: 474.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.63 : 475.61 = 318.55 : x
  2. Step 2: Convert to fraction form
    319.63/475.61 = 318.55/x
  3. Step 3: Cross multiply
    319.63x = 475.61 × 318.55
  4. Step 4: Simplify right side
    319.63x = 151,505.57
  5. Step 5: Solve for x
    x = 151,505.57/319.63
  6. Step 6: Final answer
    x = 474.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.