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Finding the Fourth Proportional to 1,129.82, 1,694.81 and 513.58

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Solution

The fourth proportional to 1,129.82, 1,694.81 and 513.58 is: 770.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.82 : 1,694.81 = 513.58 : x
  2. Step 2: Convert to fraction form
    1,129.82/1,694.81 = 513.58/x
  3. Step 3: Cross multiply
    1,129.82x = 1,694.81 × 513.58
  4. Step 4: Simplify right side
    1,129.82x = 870,413.71
  5. Step 5: Solve for x
    x = 870,413.71/1,129.82
  6. Step 6: Final answer
    x = 770.40

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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.