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Finding the Fourth Proportional to 298.74, 412.09 and 215.67

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Solution

The fourth proportional to 298.74, 412.09 and 215.67 is: 297.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.74 : 412.09 = 215.67 : x
  2. Step 2: Convert to fraction form
    298.74/412.09 = 215.67/x
  3. Step 3: Cross multiply
    298.74x = 412.09 × 215.67
  4. Step 4: Simplify right side
    298.74x = 88,875.45
  5. Step 5: Solve for x
    x = 88,875.45/298.74
  6. Step 6: Final answer
    x = 297.50

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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.