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Finding the Fourth Proportional to 279.69, 417.81 and 214.67

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Solution

The fourth proportional to 279.69, 417.81 and 214.67 is: 320.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.69 : 417.81 = 214.67 : x
  2. Step 2: Convert to fraction form
    279.69/417.81 = 214.67/x
  3. Step 3: Cross multiply
    279.69x = 417.81 × 214.67
  4. Step 4: Simplify right side
    279.69x = 89,689.18
  5. Step 5: Solve for x
    x = 89,689.18/279.69
  6. Step 6: Final answer
    x = 320.67

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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.