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Finding the Fourth Proportional to 386.83, 533.54 and 253.78

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Solution

The fourth proportional to 386.83, 533.54 and 253.78 is: 350.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.83 : 533.54 = 253.78 : x
  2. Step 2: Convert to fraction form
    386.83/533.54 = 253.78/x
  3. Step 3: Cross multiply
    386.83x = 533.54 × 253.78
  4. Step 4: Simplify right side
    386.83x = 135,402.66
  5. Step 5: Solve for x
    x = 135,402.66/386.83
  6. Step 6: Final answer
    x = 350.04

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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.