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Finding the Fourth Proportional to 727.39, 1,090.54 and 438.76

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Solution

The fourth proportional to 727.39, 1,090.54 and 438.76 is: 657.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.39 : 1,090.54 = 438.76 : x
  2. Step 2: Convert to fraction form
    727.39/1,090.54 = 438.76/x
  3. Step 3: Cross multiply
    727.39x = 1,090.54 × 438.76
  4. Step 4: Simplify right side
    727.39x = 478,485.33
  5. Step 5: Solve for x
    x = 478,485.33/727.39
  6. Step 6: Final answer
    x = 657.81

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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.