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Finding the Fourth Proportional to 304.12, 419.29 and 280.65

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Solution

The fourth proportional to 304.12, 419.29 and 280.65 is: 386.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.12 : 419.29 = 280.65 : x
  2. Step 2: Convert to fraction form
    304.12/419.29 = 280.65/x
  3. Step 3: Cross multiply
    304.12x = 419.29 × 280.65
  4. Step 4: Simplify right side
    304.12x = 117,674.61
  5. Step 5: Solve for x
    x = 117,674.61/304.12
  6. Step 6: Final answer
    x = 386.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.