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Finding the Fourth Proportional to 642.13, 961.37 and 436.39

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Solution

The fourth proportional to 642.13, 961.37 and 436.39 is: 653.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.13 : 961.37 = 436.39 : x
  2. Step 2: Convert to fraction form
    642.13/961.37 = 436.39/x
  3. Step 3: Cross multiply
    642.13x = 961.37 × 436.39
  4. Step 4: Simplify right side
    642.13x = 419,529.31
  5. Step 5: Solve for x
    x = 419,529.31/642.13
  6. Step 6: Final answer
    x = 653.34

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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.