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Finding the Fourth Proportional to 643.97, 887.32 and 436.61

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Solution

The fourth proportional to 643.97, 887.32 and 436.61 is: 601.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.97 : 887.32 = 436.61 : x
  2. Step 2: Convert to fraction form
    643.97/887.32 = 436.61/x
  3. Step 3: Cross multiply
    643.97x = 887.32 × 436.61
  4. Step 4: Simplify right side
    643.97x = 387,412.79
  5. Step 5: Solve for x
    x = 387,412.79/643.97
  6. Step 6: Final answer
    x = 601.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.