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Finding the Fourth Proportional to 809.56, 1,114.74 and 678.34

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Solution

The fourth proportional to 809.56, 1,114.74 and 678.34 is: 934.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.56 : 1,114.74 = 678.34 : x
  2. Step 2: Convert to fraction form
    809.56/1,114.74 = 678.34/x
  3. Step 3: Cross multiply
    809.56x = 1,114.74 × 678.34
  4. Step 4: Simplify right side
    809.56x = 756,172.73
  5. Step 5: Solve for x
    x = 756,172.73/809.56
  6. Step 6: Final answer
    x = 934.05

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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.