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Finding the Fourth Proportional to 727.58, 1,091.48 and 688.20

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Solution

The fourth proportional to 727.58, 1,091.48 and 688.20 is: 1,032.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.58 : 1,091.48 = 688.20 : x
  2. Step 2: Convert to fraction form
    727.58/1,091.48 = 688.20/x
  3. Step 3: Cross multiply
    727.58x = 1,091.48 × 688.20
  4. Step 4: Simplify right side
    727.58x = 751,149.00
  5. Step 5: Solve for x
    x = 751,149.00/727.58
  6. Step 6: Final answer
    x = 1,032.39

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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.