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Finding the Fourth Proportional to 672.45, 1,007.46 and 645.72

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Solution

The fourth proportional to 672.45, 1,007.46 and 645.72 is: 967.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.45 : 1,007.46 = 645.72 : x
  2. Step 2: Convert to fraction form
    672.45/1,007.46 = 645.72/x
  3. Step 3: Cross multiply
    672.45x = 1,007.46 × 645.72
  4. Step 4: Simplify right side
    672.45x = 650,537.07
  5. Step 5: Solve for x
    x = 650,537.07/672.45
  6. Step 6: Final answer
    x = 967.41

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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.