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Finding the Fourth Proportional to 280.09, 419.85 and 188.57

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Solution

The fourth proportional to 280.09, 419.85 and 188.57 is: 282.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.09 : 419.85 = 188.57 : x
  2. Step 2: Convert to fraction form
    280.09/419.85 = 188.57/x
  3. Step 3: Cross multiply
    280.09x = 419.85 × 188.57
  4. Step 4: Simplify right side
    280.09x = 79,172.16
  5. Step 5: Solve for x
    x = 79,172.16/280.09
  6. Step 6: Final answer
    x = 282.67

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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.