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Finding the Fourth Proportional to 921.27, 1,379.07 and 688.80

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Solution

The fourth proportional to 921.27, 1,379.07 and 688.80 is: 1,031.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.27 : 1,379.07 = 688.80 : x
  2. Step 2: Convert to fraction form
    921.27/1,379.07 = 688.80/x
  3. Step 3: Cross multiply
    921.27x = 1,379.07 × 688.80
  4. Step 4: Simplify right side
    921.27x = 949,903.42
  5. Step 5: Solve for x
    x = 949,903.42/921.27
  6. Step 6: Final answer
    x = 1,031.08

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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.