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Finding the Fourth Proportional to 318.30, 476.75 and 310.55

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Solution

The fourth proportional to 318.30, 476.75 and 310.55 is: 465.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.30 : 476.75 = 310.55 : x
  2. Step 2: Convert to fraction form
    318.30/476.75 = 310.55/x
  3. Step 3: Cross multiply
    318.30x = 476.75 × 310.55
  4. Step 4: Simplify right side
    318.30x = 148,050.78
  5. Step 5: Solve for x
    x = 148,050.78/318.30
  6. Step 6: Final answer
    x = 465.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.