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Finding the Fourth Proportional to 280.72, 421.45 and 188.48

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Solution

The fourth proportional to 280.72, 421.45 and 188.48 is: 282.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.72 : 421.45 = 188.48 : x
  2. Step 2: Convert to fraction form
    280.72/421.45 = 188.48/x
  3. Step 3: Cross multiply
    280.72x = 421.45 × 188.48
  4. Step 4: Simplify right side
    280.72x = 79,434.17
  5. Step 5: Solve for x
    x = 79,434.17/280.72
  6. Step 6: Final answer
    x = 282.97

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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.