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Finding the Fourth Proportional to 1,275.68, 1,912.56 and 658.56

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Solution

The fourth proportional to 1,275.68, 1,912.56 and 658.56 is: 987.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.68 : 1,912.56 = 658.56 : x
  2. Step 2: Convert to fraction form
    1,275.68/1,912.56 = 658.56/x
  3. Step 3: Cross multiply
    1,275.68x = 1,912.56 × 658.56
  4. Step 4: Simplify right side
    1,275.68x = 1,259,535.51
  5. Step 5: Solve for x
    x = 1,259,535.51/1,275.68
  6. Step 6: Final answer
    x = 987.34

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1.5x scale

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.