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Finding the Fourth Proportional to 727.20, 1,090.80 and 265.20

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Solution

The fourth proportional to 727.20, 1,090.80 and 265.20 is: 397.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.20 : 1,090.80 = 265.20 : x
  2. Step 2: Convert to fraction form
    727.20/1,090.80 = 265.20/x
  3. Step 3: Cross multiply
    727.20x = 1,090.80 × 265.20
  4. Step 4: Simplify right side
    727.20x = 289,280.16
  5. Step 5: Solve for x
    x = 289,280.16/727.20
  6. Step 6: Final answer
    x = 397.80

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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.