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Finding the Fourth Proportional to 1,090.68, 1,637.54 and 720.55

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Solution

The fourth proportional to 1,090.68, 1,637.54 and 720.55 is: 1,081.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.68 : 1,637.54 = 720.55 : x
  2. Step 2: Convert to fraction form
    1,090.68/1,637.54 = 720.55/x
  3. Step 3: Cross multiply
    1,090.68x = 1,637.54 × 720.55
  4. Step 4: Simplify right side
    1,090.68x = 1,179,929.45
  5. Step 5: Solve for x
    x = 1,179,929.45/1,090.68
  6. Step 6: Final answer
    x = 1,081.83

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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.