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Finding the Fourth Proportional to 894.36, 1,230.90 and 631.92

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Solution

The fourth proportional to 894.36, 1,230.90 and 631.92 is: 869.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.36 : 1,230.90 = 631.92 : x
  2. Step 2: Convert to fraction form
    894.36/1,230.90 = 631.92/x
  3. Step 3: Cross multiply
    894.36x = 1,230.90 × 631.92
  4. Step 4: Simplify right side
    894.36x = 777,830.33
  5. Step 5: Solve for x
    x = 777,830.33/894.36
  6. Step 6: Final answer
    x = 869.71

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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.