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Finding the Fourth Proportional to 965.28, 1,331.28 and 790.32

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Solution

The fourth proportional to 965.28, 1,331.28 and 790.32 is: 1,089.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.28 : 1,331.28 = 790.32 : x
  2. Step 2: Convert to fraction form
    965.28/1,331.28 = 790.32/x
  3. Step 3: Cross multiply
    965.28x = 1,331.28 × 790.32
  4. Step 4: Simplify right side
    965.28x = 1,052,137.21
  5. Step 5: Solve for x
    x = 1,052,137.21/965.28
  6. Step 6: Final answer
    x = 1,089.98

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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.