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Finding the Fourth Proportional to 748.60, 1,115.45 and 666.81

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Solution

The fourth proportional to 748.60, 1,115.45 and 666.81 is: 993.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.60 : 1,115.45 = 666.81 : x
  2. Step 2: Convert to fraction form
    748.60/1,115.45 = 666.81/x
  3. Step 3: Cross multiply
    748.60x = 1,115.45 × 666.81
  4. Step 4: Simplify right side
    748.60x = 743,794.88
  5. Step 5: Solve for x
    x = 743,794.88/748.60
  6. Step 6: Final answer
    x = 993.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.