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Finding the Fourth Proportional to 645.62, 890.61 and 448.79

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Solution

The fourth proportional to 645.62, 890.61 and 448.79 is: 619.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.62 : 890.61 = 448.79 : x
  2. Step 2: Convert to fraction form
    645.62/890.61 = 448.79/x
  3. Step 3: Cross multiply
    645.62x = 890.61 × 448.79
  4. Step 4: Simplify right side
    645.62x = 399,696.86
  5. Step 5: Solve for x
    x = 399,696.86/645.62
  6. Step 6: Final answer
    x = 619.09

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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.