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Finding the Fourth Proportional to 298.15, 445.07 and 261.70

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Solution

The fourth proportional to 298.15, 445.07 and 261.70 is: 390.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.15 : 445.07 = 261.70 : x
  2. Step 2: Convert to fraction form
    298.15/445.07 = 261.70/x
  3. Step 3: Cross multiply
    298.15x = 445.07 × 261.70
  4. Step 4: Simplify right side
    298.15x = 116,474.36
  5. Step 5: Solve for x
    x = 116,474.36/298.15
  6. Step 6: Final answer
    x = 390.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.