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Finding the Fourth Proportional to 405.47, 559.65 and 230.92

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Solution

The fourth proportional to 405.47, 559.65 and 230.92 is: 318.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.47 : 559.65 = 230.92 : x
  2. Step 2: Convert to fraction form
    405.47/559.65 = 230.92/x
  3. Step 3: Cross multiply
    405.47x = 559.65 × 230.92
  4. Step 4: Simplify right side
    405.47x = 129,231.58
  5. Step 5: Solve for x
    x = 129,231.58/405.47
  6. Step 6: Final answer
    x = 318.72

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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.