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Finding the Fourth Proportional to 631, 872.40 and 603.80

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Solution

The fourth proportional to 631, 872.40 and 603.80 is: 834.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    631 : 872.40 = 603.80 : x
  2. Step 2: Convert to fraction form
    631/872.40 = 603.80/x
  3. Step 3: Cross multiply
    631x = 872.40 × 603.80
  4. Step 4: Simplify right side
    631x = 526,755.12
  5. Step 5: Solve for x
    x = 526,755.12/631
  6. Step 6: Final answer
    x = 834.79

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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.