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Finding the Fourth Proportional to 405.64, 559.77 and 228.61

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Solution

The fourth proportional to 405.64, 559.77 and 228.61 is: 315.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.64 : 559.77 = 228.61 : x
  2. Step 2: Convert to fraction form
    405.64/559.77 = 228.61/x
  3. Step 3: Cross multiply
    405.64x = 559.77 × 228.61
  4. Step 4: Simplify right side
    405.64x = 127,967.05
  5. Step 5: Solve for x
    x = 127,967.05/405.64
  6. Step 6: Final answer
    x = 315.47

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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.