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Finding the Fourth Proportional to 405.27, 558.50 and 288.63

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Solution

The fourth proportional to 405.27, 558.50 and 288.63 is: 397.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.27 : 558.50 = 288.63 : x
  2. Step 2: Convert to fraction form
    405.27/558.50 = 288.63/x
  3. Step 3: Cross multiply
    405.27x = 558.50 × 288.63
  4. Step 4: Simplify right side
    405.27x = 161,198.41
  5. Step 5: Solve for x
    x = 161,198.41/405.27
  6. Step 6: Final answer
    x = 397.76

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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.