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Finding the Fourth Proportional to 675.36, 1,011.42 and 644.04

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Solution

The fourth proportional to 675.36, 1,011.42 and 644.04 is: 964.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.36 : 1,011.42 = 644.04 : x
  2. Step 2: Convert to fraction form
    675.36/1,011.42 = 644.04/x
  3. Step 3: Cross multiply
    675.36x = 1,011.42 × 644.04
  4. Step 4: Simplify right side
    675.36x = 651,394.94
  5. Step 5: Solve for x
    x = 651,394.94/675.36
  6. Step 6: Final answer
    x = 964.52

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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.