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Finding the Fourth Proportional to 727.60, 1,090.93 and 311.40

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Solution

The fourth proportional to 727.60, 1,090.93 and 311.40 is: 466.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.60 : 1,090.93 = 311.40 : x
  2. Step 2: Convert to fraction form
    727.60/1,090.93 = 311.40/x
  3. Step 3: Cross multiply
    727.60x = 1,090.93 × 311.40
  4. Step 4: Simplify right side
    727.60x = 339,721.40
  5. Step 5: Solve for x
    x = 339,721.40/727.60
  6. Step 6: Final answer
    x = 466.91

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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.