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Finding the Fourth Proportional to 1,309.08, 1,963.68 and 443.40

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Solution

The fourth proportional to 1,309.08, 1,963.68 and 443.40 is: 665.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.08 : 1,963.68 = 443.40 : x
  2. Step 2: Convert to fraction form
    1,309.08/1,963.68 = 443.40/x
  3. Step 3: Cross multiply
    1,309.08x = 1,963.68 × 443.40
  4. Step 4: Simplify right side
    1,309.08x = 870,695.71
  5. Step 5: Solve for x
    x = 870,695.71/1,309.08
  6. Step 6: Final answer
    x = 665.12

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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.