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Finding the Fourth Proportional to 1,090.13, 1,635.26 and 359.78

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Solution

The fourth proportional to 1,090.13, 1,635.26 and 359.78 is: 539.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.13 : 1,635.26 = 359.78 : x
  2. Step 2: Convert to fraction form
    1,090.13/1,635.26 = 359.78/x
  3. Step 3: Cross multiply
    1,090.13x = 1,635.26 × 359.78
  4. Step 4: Simplify right side
    1,090.13x = 588,323.87
  5. Step 5: Solve for x
    x = 588,323.87/1,090.13
  6. Step 6: Final answer
    x = 539.68

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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.