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Finding the Fourth Proportional to 1,090.79, 1,635.18 and 397.16

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Solution

The fourth proportional to 1,090.79, 1,635.18 and 397.16 is: 595.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.79 : 1,635.18 = 397.16 : x
  2. Step 2: Convert to fraction form
    1,090.79/1,635.18 = 397.16/x
  3. Step 3: Cross multiply
    1,090.79x = 1,635.18 × 397.16
  4. Step 4: Simplify right side
    1,090.79x = 649,419.91
  5. Step 5: Solve for x
    x = 649,419.91/1,090.79
  6. Step 6: Final answer
    x = 595.37

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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.