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Finding the Fourth Proportional to 962.82, 1,327.80 and 643.23

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Solution

The fourth proportional to 962.82, 1,327.80 and 643.23 is: 887.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    962.82 : 1,327.80 = 643.23 : x
  2. Step 2: Convert to fraction form
    962.82/1,327.80 = 643.23/x
  3. Step 3: Cross multiply
    962.82x = 1,327.80 × 643.23
  4. Step 4: Simplify right side
    962.82x = 854,080.79
  5. Step 5: Solve for x
    x = 854,080.79/962.82
  6. Step 6: Final answer
    x = 887.06

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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.