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Finding the Fourth Proportional to 920.26, 1,380.51 and 343.06

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Solution

The fourth proportional to 920.26, 1,380.51 and 343.06 is: 514.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.26 : 1,380.51 = 343.06 : x
  2. Step 2: Convert to fraction form
    920.26/1,380.51 = 343.06/x
  3. Step 3: Cross multiply
    920.26x = 1,380.51 × 343.06
  4. Step 4: Simplify right side
    920.26x = 473,597.76
  5. Step 5: Solve for x
    x = 473,597.76/920.26
  6. Step 6: Final answer
    x = 514.63

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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.