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Finding the Fourth Proportional to 447.18, 616.74 and 388.86

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Solution

The fourth proportional to 447.18, 616.74 and 388.86 is: 536.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.18 : 616.74 = 388.86 : x
  2. Step 2: Convert to fraction form
    447.18/616.74 = 388.86/x
  3. Step 3: Cross multiply
    447.18x = 616.74 × 388.86
  4. Step 4: Simplify right side
    447.18x = 239,825.52
  5. Step 5: Solve for x
    x = 239,825.52/447.18
  6. Step 6: Final answer
    x = 536.31

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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.