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Finding the Fourth Proportional to 1,035.56, 1,428.36 and 991.28

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Solution

The fourth proportional to 1,035.56, 1,428.36 and 991.28 is: 1,367.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.56 : 1,428.36 = 991.28 : x
  2. Step 2: Convert to fraction form
    1,035.56/1,428.36 = 991.28/x
  3. Step 3: Cross multiply
    1,035.56x = 1,428.36 × 991.28
  4. Step 4: Simplify right side
    1,035.56x = 1,415,904.70
  5. Step 5: Solve for x
    x = 1,415,904.70/1,035.56
  6. Step 6: Final answer
    x = 1,367.28

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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.