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Finding the Fourth Proportional to 1,090.20, 1,504.42 and 642.16

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Solution

The fourth proportional to 1,090.20, 1,504.42 and 642.16 is: 886.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.20 : 1,504.42 = 642.16 : x
  2. Step 2: Convert to fraction form
    1,090.20/1,504.42 = 642.16/x
  3. Step 3: Cross multiply
    1,090.20x = 1,504.42 × 642.16
  4. Step 4: Simplify right side
    1,090.20x = 966,078.35
  5. Step 5: Solve for x
    x = 966,078.35/1,090.20
  6. Step 6: Final answer
    x = 886.15

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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.