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Finding the Fourth Proportional to 809.23, 1,212.89 and 375.47

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Solution

The fourth proportional to 809.23, 1,212.89 and 375.47 is: 562.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.23 : 1,212.89 = 375.47 : x
  2. Step 2: Convert to fraction form
    809.23/1,212.89 = 375.47/x
  3. Step 3: Cross multiply
    809.23x = 1,212.89 × 375.47
  4. Step 4: Simplify right side
    809.23x = 455,403.81
  5. Step 5: Solve for x
    x = 455,403.81/809.23
  6. Step 6: Final answer
    x = 562.76

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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.