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Finding the Fourth Proportional to 1,435.28, 1,980.96 and 911.36

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Solution

The fourth proportional to 1,435.28, 1,980.96 and 911.36 is: 1,257.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.28 : 1,980.96 = 911.36 : x
  2. Step 2: Convert to fraction form
    1,435.28/1,980.96 = 911.36/x
  3. Step 3: Cross multiply
    1,435.28x = 1,980.96 × 911.36
  4. Step 4: Simplify right side
    1,435.28x = 1,805,367.71
  5. Step 5: Solve for x
    x = 1,805,367.71/1,435.28
  6. Step 6: Final answer
    x = 1,257.85

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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.