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Finding the Fourth Proportional to 287.23, 393.21 and 277.92

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Solution

The fourth proportional to 287.23, 393.21 and 277.92 is: 380.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.23 : 393.21 = 277.92 : x
  2. Step 2: Convert to fraction form
    287.23/393.21 = 277.92/x
  3. Step 3: Cross multiply
    287.23x = 393.21 × 277.92
  4. Step 4: Simplify right side
    287.23x = 109,280.92
  5. Step 5: Solve for x
    x = 109,280.92/287.23
  6. Step 6: Final answer
    x = 380.46

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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.