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Finding the Fourth Proportional to 729.48, 1,006.05 and 636.09

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Solution

The fourth proportional to 729.48, 1,006.05 and 636.09 is: 877.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.48 : 1,006.05 = 636.09 : x
  2. Step 2: Convert to fraction form
    729.48/1,006.05 = 636.09/x
  3. Step 3: Cross multiply
    729.48x = 1,006.05 × 636.09
  4. Step 4: Simplify right side
    729.48x = 639,938.34
  5. Step 5: Solve for x
    x = 639,938.34/729.48
  6. Step 6: Final answer
    x = 877.25

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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.