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Finding the Fourth Proportional to 967.81, 1,333.35 and 668.77

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Solution

The fourth proportional to 967.81, 1,333.35 and 668.77 is: 921.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.81 : 1,333.35 = 668.77 : x
  2. Step 2: Convert to fraction form
    967.81/1,333.35 = 668.77/x
  3. Step 3: Cross multiply
    967.81x = 1,333.35 × 668.77
  4. Step 4: Simplify right side
    967.81x = 891,704.48
  5. Step 5: Solve for x
    x = 891,704.48/967.81
  6. Step 6: Final answer
    x = 921.36

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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.