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Finding the Fourth Proportional to 405.86, 562.30 and 397.22

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Solution

The fourth proportional to 405.86, 562.30 and 397.22 is: 550.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.86 : 562.30 = 397.22 : x
  2. Step 2: Convert to fraction form
    405.86/562.30 = 397.22/x
  3. Step 3: Cross multiply
    405.86x = 562.30 × 397.22
  4. Step 4: Simplify right side
    405.86x = 223,354.82
  5. Step 5: Solve for x
    x = 223,354.82/405.86
  6. Step 6: Final answer
    x = 550.32

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.