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Finding the Fourth Proportional to 482.78, 666.26 and 308.36

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Solution

The fourth proportional to 482.78, 666.26 and 308.36 is: 425.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.78 : 666.26 = 308.36 : x
  2. Step 2: Convert to fraction form
    482.78/666.26 = 308.36/x
  3. Step 3: Cross multiply
    482.78x = 666.26 × 308.36
  4. Step 4: Simplify right side
    482.78x = 205,447.93
  5. Step 5: Solve for x
    x = 205,447.93/482.78
  6. Step 6: Final answer
    x = 425.55

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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.