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Finding the Fourth Proportional to 1,275.00, 1,912.80 and 397.46

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Solution

The fourth proportional to 1,275.00, 1,912.80 and 397.46 is: 596.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.00 : 1,912.80 = 397.46 : x
  2. Step 2: Convert to fraction form
    1,275.00/1,912.80 = 397.46/x
  3. Step 3: Cross multiply
    1,275.00x = 1,912.80 × 397.46
  4. Step 4: Simplify right side
    1,275.00x = 760,250.43
  5. Step 5: Solve for x
    x = 760,250.43/1,275.00
  6. Step 6: Final answer
    x = 596.28

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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.