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Finding the Fourth Proportional to 651.74, 903.69 and 628.65

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Solution

The fourth proportional to 651.74, 903.69 and 628.65 is: 871.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.74 : 903.69 = 628.65 : x
  2. Step 2: Convert to fraction form
    651.74/903.69 = 628.65/x
  3. Step 3: Cross multiply
    651.74x = 903.69 × 628.65
  4. Step 4: Simplify right side
    651.74x = 568,104.72
  5. Step 5: Solve for x
    x = 568,104.72/651.74
  6. Step 6: Final answer
    x = 871.68

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.