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Finding the Fourth Proportional to 663.69, 915.09 and 573.80

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Solution

The fourth proportional to 663.69, 915.09 and 573.80 is: 791.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.69 : 915.09 = 573.80 : x
  2. Step 2: Convert to fraction form
    663.69/915.09 = 573.80/x
  3. Step 3: Cross multiply
    663.69x = 915.09 × 573.80
  4. Step 4: Simplify right side
    663.69x = 525,078.64
  5. Step 5: Solve for x
    x = 525,078.64/663.69
  6. Step 6: Final answer
    x = 791.15

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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.