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Finding the Fourth Proportional to 1,308.61, 1,963.20 and 431.08

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Solution

The fourth proportional to 1,308.61, 1,963.20 and 431.08 is: 646.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.61 : 1,963.20 = 431.08 : x
  2. Step 2: Convert to fraction form
    1,308.61/1,963.20 = 431.08/x
  3. Step 3: Cross multiply
    1,308.61x = 1,963.20 × 431.08
  4. Step 4: Simplify right side
    1,308.61x = 846,292.96
  5. Step 5: Solve for x
    x = 846,292.96/1,308.61
  6. Step 6: Final answer
    x = 646.71

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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.