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Finding the Fourth Proportional to 285.36, 391.44 and 268.80

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Solution

The fourth proportional to 285.36, 391.44 and 268.80 is: 368.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.36 : 391.44 = 268.80 : x
  2. Step 2: Convert to fraction form
    285.36/391.44 = 268.80/x
  3. Step 3: Cross multiply
    285.36x = 391.44 × 268.80
  4. Step 4: Simplify right side
    285.36x = 105,219.07
  5. Step 5: Solve for x
    x = 105,219.07/285.36
  6. Step 6: Final answer
    x = 368.72

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.