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Finding the Fourth Proportional to 287.40, 395.79 and 245.94

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Solution

The fourth proportional to 287.40, 395.79 and 245.94 is: 338.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.40 : 395.79 = 245.94 : x
  2. Step 2: Convert to fraction form
    287.40/395.79 = 245.94/x
  3. Step 3: Cross multiply
    287.40x = 395.79 × 245.94
  4. Step 4: Simplify right side
    287.40x = 97,338.19
  5. Step 5: Solve for x
    x = 97,338.19/287.40
  6. Step 6: Final answer
    x = 338.69

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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.