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Finding the Fourth Proportional to 965.70, 1,331.78 and 634.30

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Solution

The fourth proportional to 965.70, 1,331.78 and 634.30 is: 874.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.70 : 1,331.78 = 634.30 : x
  2. Step 2: Convert to fraction form
    965.70/1,331.78 = 634.30/x
  3. Step 3: Cross multiply
    965.70x = 1,331.78 × 634.30
  4. Step 4: Simplify right side
    965.70x = 844,741.55
  5. Step 5: Solve for x
    x = 844,741.55/965.70
  6. Step 6: Final answer
    x = 874.75

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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.