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Finding the Fourth Proportional to 800.29, 1,200.59 and 313.31

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Solution

The fourth proportional to 800.29, 1,200.59 and 313.31 is: 470.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.29 : 1,200.59 = 313.31 : x
  2. Step 2: Convert to fraction form
    800.29/1,200.59 = 313.31/x
  3. Step 3: Cross multiply
    800.29x = 1,200.59 × 313.31
  4. Step 4: Simplify right side
    800.29x = 376,156.85
  5. Step 5: Solve for x
    x = 376,156.85/800.29
  6. Step 6: Final answer
    x = 470.03

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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.