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Finding the Fourth Proportional to 965.20, 1,444.20 and 641.20

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Solution

The fourth proportional to 965.20, 1,444.20 and 641.20 is: 959.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.20 : 1,444.20 = 641.20 : x
  2. Step 2: Convert to fraction form
    965.20/1,444.20 = 641.20/x
  3. Step 3: Cross multiply
    965.20x = 1,444.20 × 641.20
  4. Step 4: Simplify right side
    965.20x = 926,021.04
  5. Step 5: Solve for x
    x = 926,021.04/965.20
  6. Step 6: Final answer
    x = 959.41

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1.5x scale

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.