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Finding the Fourth Proportional to 965.90, 1,332.58 and 667.21

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Solution

The fourth proportional to 965.90, 1,332.58 and 667.21 is: 920.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.90 : 1,332.58 = 667.21 : x
  2. Step 2: Convert to fraction form
    965.90/1,332.58 = 667.21/x
  3. Step 3: Cross multiply
    965.90x = 1,332.58 × 667.21
  4. Step 4: Simplify right side
    965.90x = 889,110.70
  5. Step 5: Solve for x
    x = 889,110.70/965.90
  6. Step 6: Final answer
    x = 920.50

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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.