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Finding the Fourth Proportional to 419.69, 579.71 and 322.65

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Solution

The fourth proportional to 419.69, 579.71 and 322.65 is: 445.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.69 : 579.71 = 322.65 : x
  2. Step 2: Convert to fraction form
    419.69/579.71 = 322.65/x
  3. Step 3: Cross multiply
    419.69x = 579.71 × 322.65
  4. Step 4: Simplify right side
    419.69x = 187,044.24
  5. Step 5: Solve for x
    x = 187,044.24/419.69
  6. Step 6: Final answer
    x = 445.67

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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.