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Finding the Fourth Proportional to 280.08, 418.86 and 188.64

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Solution

The fourth proportional to 280.08, 418.86 and 188.64 is: 282.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.08 : 418.86 = 188.64 : x
  2. Step 2: Convert to fraction form
    280.08/418.86 = 188.64/x
  3. Step 3: Cross multiply
    280.08x = 418.86 × 188.64
  4. Step 4: Simplify right side
    280.08x = 79,013.75
  5. Step 5: Solve for x
    x = 79,013.75/280.08
  6. Step 6: Final answer
    x = 282.11

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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.