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Finding the Fourth Proportional to 1,309.05, 1,963.32 and 487.37

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Solution

The fourth proportional to 1,309.05, 1,963.32 and 487.37 is: 730.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.05 : 1,963.32 = 487.37 : x
  2. Step 2: Convert to fraction form
    1,309.05/1,963.32 = 487.37/x
  3. Step 3: Cross multiply
    1,309.05x = 1,963.32 × 487.37
  4. Step 4: Simplify right side
    1,309.05x = 956,853.45
  5. Step 5: Solve for x
    x = 956,853.45/1,309.05
  6. Step 6: Final answer
    x = 730.95

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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.