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Finding the Fourth Proportional to 806.80, 1,210.34 and 293.80

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Solution

The fourth proportional to 806.80, 1,210.34 and 293.80 is: 440.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.80 : 1,210.34 = 293.80 : x
  2. Step 2: Convert to fraction form
    806.80/1,210.34 = 293.80/x
  3. Step 3: Cross multiply
    806.80x = 1,210.34 × 293.80
  4. Step 4: Simplify right side
    806.80x = 355,597.89
  5. Step 5: Solve for x
    x = 355,597.89/806.80
  6. Step 6: Final answer
    x = 440.75

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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.