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Finding the Fourth Proportional to 280.30, 420.41 and 189.58

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Solution

The fourth proportional to 280.30, 420.41 and 189.58 is: 284.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.30 : 420.41 = 189.58 : x
  2. Step 2: Convert to fraction form
    280.30/420.41 = 189.58/x
  3. Step 3: Cross multiply
    280.30x = 420.41 × 189.58
  4. Step 4: Simplify right side
    280.30x = 79,699.23
  5. Step 5: Solve for x
    x = 79,699.23/280.30
  6. Step 6: Final answer
    x = 284.34

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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.