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Finding the Fourth Proportional to 1,292.82, 1,938.79 and 513.01

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Solution

The fourth proportional to 1,292.82, 1,938.79 and 513.01 is: 769.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.82 : 1,938.79 = 513.01 : x
  2. Step 2: Convert to fraction form
    1,292.82/1,938.79 = 513.01/x
  3. Step 3: Cross multiply
    1,292.82x = 1,938.79 × 513.01
  4. Step 4: Simplify right side
    1,292.82x = 994,618.66
  5. Step 5: Solve for x
    x = 994,618.66/1,292.82
  6. Step 6: Final answer
    x = 769.34

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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.