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Finding the Fourth Proportional to 994.52, 1,372.56 and 645.08

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Solution

The fourth proportional to 994.52, 1,372.56 and 645.08 is: 890.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.52 : 1,372.56 = 645.08 : x
  2. Step 2: Convert to fraction form
    994.52/1,372.56 = 645.08/x
  3. Step 3: Cross multiply
    994.52x = 1,372.56 × 645.08
  4. Step 4: Simplify right side
    994.52x = 885,411.00
  5. Step 5: Solve for x
    x = 885,411.00/994.52
  6. Step 6: Final answer
    x = 890.29

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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.