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Finding the Fourth Proportional to 965.55, 1,333.40 and 667.56

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Solution

The fourth proportional to 965.55, 1,333.40 and 667.56 is: 921.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.55 : 1,333.40 = 667.56 : x
  2. Step 2: Convert to fraction form
    965.55/1,333.40 = 667.56/x
  3. Step 3: Cross multiply
    965.55x = 1,333.40 × 667.56
  4. Step 4: Simplify right side
    965.55x = 890,126.17
  5. Step 5: Solve for x
    x = 890,126.17/965.55
  6. Step 6: Final answer
    x = 921.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.