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Finding the Fourth Proportional to 399.74, 598.69 and 318.63

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Solution

The fourth proportional to 399.74, 598.69 and 318.63 is: 477.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.74 : 598.69 = 318.63 : x
  2. Step 2: Convert to fraction form
    399.74/598.69 = 318.63/x
  3. Step 3: Cross multiply
    399.74x = 598.69 × 318.63
  4. Step 4: Simplify right side
    399.74x = 190,759.00
  5. Step 5: Solve for x
    x = 190,759.00/399.74
  6. Step 6: Final answer
    x = 477.21

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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.