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Finding the Fourth Proportional to 483.93, 668.43 and 390.99

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Solution

The fourth proportional to 483.93, 668.43 and 390.99 is: 540.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.93 : 668.43 = 390.99 : x
  2. Step 2: Convert to fraction form
    483.93/668.43 = 390.99/x
  3. Step 3: Cross multiply
    483.93x = 668.43 × 390.99
  4. Step 4: Simplify right side
    483.93x = 261,349.45
  5. Step 5: Solve for x
    x = 261,349.45/483.93
  6. Step 6: Final answer
    x = 540.06

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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.