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Finding the Fourth Proportional to 1,293.60, 1,939.50 and 513.72

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Solution

The fourth proportional to 1,293.60, 1,939.50 and 513.72 is: 770.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.60 : 1,939.50 = 513.72 : x
  2. Step 2: Convert to fraction form
    1,293.60/1,939.50 = 513.72/x
  3. Step 3: Cross multiply
    1,293.60x = 1,939.50 × 513.72
  4. Step 4: Simplify right side
    1,293.60x = 996,359.94
  5. Step 5: Solve for x
    x = 996,359.94/1,293.60
  6. Step 6: Final answer
    x = 770.22

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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.