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Finding the Fourth Proportional to 1,309.23, 1,963.91 and 487.31

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Solution

The fourth proportional to 1,309.23, 1,963.91 and 487.31 is: 730.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.23 : 1,963.91 = 487.31 : x
  2. Step 2: Convert to fraction form
    1,309.23/1,963.91 = 487.31/x
  3. Step 3: Cross multiply
    1,309.23x = 1,963.91 × 487.31
  4. Step 4: Simplify right side
    1,309.23x = 957,032.98
  5. Step 5: Solve for x
    x = 957,032.98/1,309.23
  6. Step 6: Final answer
    x = 730.99

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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.