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Finding the Fourth Proportional to 1,308.63, 1,963.15 and 430.87

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Solution

The fourth proportional to 1,308.63, 1,963.15 and 430.87 is: 646.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.63 : 1,963.15 = 430.87 : x
  2. Step 2: Convert to fraction form
    1,308.63/1,963.15 = 430.87/x
  3. Step 3: Cross multiply
    1,308.63x = 1,963.15 × 430.87
  4. Step 4: Simplify right side
    1,308.63x = 845,862.44
  5. Step 5: Solve for x
    x = 845,862.44/1,308.63
  6. Step 6: Final answer
    x = 646.37

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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.