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Finding the Fourth Proportional to 388.69, 536.40 and 257.94

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Solution

The fourth proportional to 388.69, 536.40 and 257.94 is: 355.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.69 : 536.40 = 257.94 : x
  2. Step 2: Convert to fraction form
    388.69/536.40 = 257.94/x
  3. Step 3: Cross multiply
    388.69x = 536.40 × 257.94
  4. Step 4: Simplify right side
    388.69x = 138,359.02
  5. Step 5: Solve for x
    x = 138,359.02/388.69
  6. Step 6: Final answer
    x = 355.96

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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.