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Finding the Fourth Proportional to 726.90, 1,090.36 and 239.99

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Solution

The fourth proportional to 726.90, 1,090.36 and 239.99 is: 359.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.90 : 1,090.36 = 239.99 : x
  2. Step 2: Convert to fraction form
    726.90/1,090.36 = 239.99/x
  3. Step 3: Cross multiply
    726.90x = 1,090.36 × 239.99
  4. Step 4: Simplify right side
    726.90x = 261,675.13
  5. Step 5: Solve for x
    x = 261,675.13/726.90
  6. Step 6: Final answer
    x = 359.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.