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Finding the Fourth Proportional to 298.76, 448.20 and 103.75

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Solution

The fourth proportional to 298.76, 448.20 and 103.75 is: 155.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.76 : 448.20 = 103.75 : x
  2. Step 2: Convert to fraction form
    298.76/448.20 = 103.75/x
  3. Step 3: Cross multiply
    298.76x = 448.20 × 103.75
  4. Step 4: Simplify right side
    298.76x = 46,499.63
  5. Step 5: Solve for x
    x = 46,499.63/298.76
  6. Step 6: Final answer
    x = 155.64

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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.