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Finding the Fourth Proportional to 280.32, 419.94 and 279.24

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Solution

The fourth proportional to 280.32, 419.94 and 279.24 is: 418.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.32 : 419.94 = 279.24 : x
  2. Step 2: Convert to fraction form
    280.32/419.94 = 279.24/x
  3. Step 3: Cross multiply
    280.32x = 419.94 × 279.24
  4. Step 4: Simplify right side
    280.32x = 117,264.05
  5. Step 5: Solve for x
    x = 117,264.05/280.32
  6. Step 6: Final answer
    x = 418.32

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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.