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Finding the Fourth Proportional to 280.11, 420.41 and 188.92

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Solution

The fourth proportional to 280.11, 420.41 and 188.92 is: 283.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.11 : 420.41 = 188.92 : x
  2. Step 2: Convert to fraction form
    280.11/420.41 = 188.92/x
  3. Step 3: Cross multiply
    280.11x = 420.41 × 188.92
  4. Step 4: Simplify right side
    280.11x = 79,423.86
  5. Step 5: Solve for x
    x = 79,423.86/280.11
  6. Step 6: Final answer
    x = 283.55

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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.