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Finding the Fourth Proportional to 986.28, 1,357.42 and 959.12

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Solution

The fourth proportional to 986.28, 1,357.42 and 959.12 is: 1,320.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.28 : 1,357.42 = 959.12 : x
  2. Step 2: Convert to fraction form
    986.28/1,357.42 = 959.12/x
  3. Step 3: Cross multiply
    986.28x = 1,357.42 × 959.12
  4. Step 4: Simplify right side
    986.28x = 1,301,928.67
  5. Step 5: Solve for x
    x = 1,301,928.67/986.28
  6. Step 6: Final answer
    x = 1,320.04

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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.