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Finding the Fourth Proportional to 1,090.20, 1,635.30 and 543.45

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Solution

The fourth proportional to 1,090.20, 1,635.30 and 543.45 is: 815.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.20 : 1,635.30 = 543.45 : x
  2. Step 2: Convert to fraction form
    1,090.20/1,635.30 = 543.45/x
  3. Step 3: Cross multiply
    1,090.20x = 1,635.30 × 543.45
  4. Step 4: Simplify right side
    1,090.20x = 888,703.79
  5. Step 5: Solve for x
    x = 888,703.79/1,090.20
  6. Step 6: Final answer
    x = 815.18

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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.