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Finding the Fourth Proportional to 1,283.15, 1,928.34 and 763.25

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Solution

The fourth proportional to 1,283.15, 1,928.34 and 763.25 is: 1,147.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.15 : 1,928.34 = 763.25 : x
  2. Step 2: Convert to fraction form
    1,283.15/1,928.34 = 763.25/x
  3. Step 3: Cross multiply
    1,283.15x = 1,928.34 × 763.25
  4. Step 4: Simplify right side
    1,283.15x = 1,471,805.51
  5. Step 5: Solve for x
    x = 1,471,805.51/1,283.15
  6. Step 6: Final answer
    x = 1,147.03

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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.