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Finding the Fourth Proportional to 729.50, 1,006.40 and 679.41

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Solution

The fourth proportional to 729.50, 1,006.40 and 679.41 is: 937.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.50 : 1,006.40 = 679.41 : x
  2. Step 2: Convert to fraction form
    729.50/1,006.40 = 679.41/x
  3. Step 3: Cross multiply
    729.50x = 1,006.40 × 679.41
  4. Step 4: Simplify right side
    729.50x = 683,754.83
  5. Step 5: Solve for x
    x = 683,754.83/729.50
  6. Step 6: Final answer
    x = 937.30

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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.