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Finding the Fourth Proportional to 279.64, 419.46 and 74.20

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Solution

The fourth proportional to 279.64, 419.46 and 74.20 is: 111.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.64 : 419.46 = 74.20 : x
  2. Step 2: Convert to fraction form
    279.64/419.46 = 74.20/x
  3. Step 3: Cross multiply
    279.64x = 419.46 × 74.20
  4. Step 4: Simplify right side
    279.64x = 31,124.70
  5. Step 5: Solve for x
    x = 31,124.70/279.64
  6. Step 6: Final answer
    x = 111.30

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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.