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Finding the Fourth Proportional to 1,309.10, 1,963.79 and 431.68

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Solution

The fourth proportional to 1,309.10, 1,963.79 and 431.68 is: 647.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.10 : 1,963.79 = 431.68 : x
  2. Step 2: Convert to fraction form
    1,309.10/1,963.79 = 431.68/x
  3. Step 3: Cross multiply
    1,309.10x = 1,963.79 × 431.68
  4. Step 4: Simplify right side
    1,309.10x = 847,728.87
  5. Step 5: Solve for x
    x = 847,728.87/1,309.10
  6. Step 6: Final answer
    x = 647.57

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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.