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Finding the Fourth Proportional to 920.24, 1,269.76 and 516.49

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Solution

The fourth proportional to 920.24, 1,269.76 and 516.49 is: 712.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.24 : 1,269.76 = 516.49 : x
  2. Step 2: Convert to fraction form
    920.24/1,269.76 = 516.49/x
  3. Step 3: Cross multiply
    920.24x = 1,269.76 × 516.49
  4. Step 4: Simplify right side
    920.24x = 655,809.41
  5. Step 5: Solve for x
    x = 655,809.41/920.24
  6. Step 6: Final answer
    x = 712.65

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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.