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Finding the Fourth Proportional to 304.28, 419.98 and 279.70

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Solution

The fourth proportional to 304.28, 419.98 and 279.70 is: 386.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.28 : 419.98 = 279.70 : x
  2. Step 2: Convert to fraction form
    304.28/419.98 = 279.70/x
  3. Step 3: Cross multiply
    304.28x = 419.98 × 279.70
  4. Step 4: Simplify right side
    304.28x = 117,468.41
  5. Step 5: Solve for x
    x = 117,468.41/304.28
  6. Step 6: Final answer
    x = 386.05

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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.