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Finding the Fourth Proportional to 405.58, 559.55 and 281.35

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Solution

The fourth proportional to 405.58, 559.55 and 281.35 is: 388.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.58 : 559.55 = 281.35 : x
  2. Step 2: Convert to fraction form
    405.58/559.55 = 281.35/x
  3. Step 3: Cross multiply
    405.58x = 559.55 × 281.35
  4. Step 4: Simplify right side
    405.58x = 157,429.39
  5. Step 5: Solve for x
    x = 157,429.39/405.58
  6. Step 6: Final answer
    x = 388.16

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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.