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Finding the Fourth Proportional to 388.41, 536.46 and 257.19

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Solution

The fourth proportional to 388.41, 536.46 and 257.19 is: 355.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.41 : 536.46 = 257.19 : x
  2. Step 2: Convert to fraction form
    388.41/536.46 = 257.19/x
  3. Step 3: Cross multiply
    388.41x = 536.46 × 257.19
  4. Step 4: Simplify right side
    388.41x = 137,969.17
  5. Step 5: Solve for x
    x = 137,969.17/388.41
  6. Step 6: Final answer
    x = 355.22

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.