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Finding the Fourth Proportional to 280.09, 419.72 and 135.64

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Solution

The fourth proportional to 280.09, 419.72 and 135.64 is: 203.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.09 : 419.72 = 135.64 : x
  2. Step 2: Convert to fraction form
    280.09/419.72 = 135.64/x
  3. Step 3: Cross multiply
    280.09x = 419.72 × 135.64
  4. Step 4: Simplify right side
    280.09x = 56,930.82
  5. Step 5: Solve for x
    x = 56,930.82/280.09
  6. Step 6: Final answer
    x = 203.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.