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Finding the Fourth Proportional to 1,275.95, 1,912.33 and 690.95

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Solution

The fourth proportional to 1,275.95, 1,912.33 and 690.95 is: 1,035.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.95 : 1,912.33 = 690.95 : x
  2. Step 2: Convert to fraction form
    1,275.95/1,912.33 = 690.95/x
  3. Step 3: Cross multiply
    1,275.95x = 1,912.33 × 690.95
  4. Step 4: Simplify right side
    1,275.95x = 1,321,320.96
  5. Step 5: Solve for x
    x = 1,321,320.96/1,275.95
  6. Step 6: Final answer
    x = 1,035.56

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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.