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Finding the Fourth Proportional to 287.06, 395.96 and 188.78

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Solution

The fourth proportional to 287.06, 395.96 and 188.78 is: 260.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.06 : 395.96 = 188.78 : x
  2. Step 2: Convert to fraction form
    287.06/395.96 = 188.78/x
  3. Step 3: Cross multiply
    287.06x = 395.96 × 188.78
  4. Step 4: Simplify right side
    287.06x = 74,746.41
  5. Step 5: Solve for x
    x = 74,746.41/287.06
  6. Step 6: Final answer
    x = 260.39

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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.