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Finding the Fourth Proportional to 1,286.25, 1,775.23 and 762.18

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Solution

The fourth proportional to 1,286.25, 1,775.23 and 762.18 is: 1,051.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.25 : 1,775.23 = 762.18 : x
  2. Step 2: Convert to fraction form
    1,286.25/1,775.23 = 762.18/x
  3. Step 3: Cross multiply
    1,286.25x = 1,775.23 × 762.18
  4. Step 4: Simplify right side
    1,286.25x = 1,353,042.90
  5. Step 5: Solve for x
    x = 1,353,042.90/1,286.25
  6. Step 6: Final answer
    x = 1,051.93

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1.5x scale

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.