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Finding the Fourth Proportional to 965.31, 1,447.90 and 380.28

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Solution

The fourth proportional to 965.31, 1,447.90 and 380.28 is: 570.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.31 : 1,447.90 = 380.28 : x
  2. Step 2: Convert to fraction form
    965.31/1,447.90 = 380.28/x
  3. Step 3: Cross multiply
    965.31x = 1,447.90 × 380.28
  4. Step 4: Simplify right side
    965.31x = 550,607.41
  5. Step 5: Solve for x
    x = 550,607.41/965.31
  6. Step 6: Final answer
    x = 570.39

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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.