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Finding the Fourth Proportional to 305.12, 457.28 and 189.68

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Solution

The fourth proportional to 305.12, 457.28 and 189.68 is: 284.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.12 : 457.28 = 189.68 : x
  2. Step 2: Convert to fraction form
    305.12/457.28 = 189.68/x
  3. Step 3: Cross multiply
    305.12x = 457.28 × 189.68
  4. Step 4: Simplify right side
    305.12x = 86,736.87
  5. Step 5: Solve for x
    x = 86,736.87/305.12
  6. Step 6: Final answer
    x = 284.27

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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.