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Finding the Fourth Proportional to 628.02, 940.71 and 318.93

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Solution

The fourth proportional to 628.02, 940.71 and 318.93 is: 477.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.02 : 940.71 = 318.93 : x
  2. Step 2: Convert to fraction form
    628.02/940.71 = 318.93/x
  3. Step 3: Cross multiply
    628.02x = 940.71 × 318.93
  4. Step 4: Simplify right side
    628.02x = 300,020.64
  5. Step 5: Solve for x
    x = 300,020.64/628.02
  6. Step 6: Final answer
    x = 477.72

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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.