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Finding the Fourth Proportional to 890.58, 1,229.04 and 628.68

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Solution

The fourth proportional to 890.58, 1,229.04 and 628.68 is: 867.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.58 : 1,229.04 = 628.68 : x
  2. Step 2: Convert to fraction form
    890.58/1,229.04 = 628.68/x
  3. Step 3: Cross multiply
    890.58x = 1,229.04 × 628.68
  4. Step 4: Simplify right side
    890.58x = 772,672.87
  5. Step 5: Solve for x
    x = 772,672.87/890.58
  6. Step 6: Final answer
    x = 867.61

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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.