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Finding the Fourth Proportional to 1,275.66, 1,912.25 and 453.35

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Solution

The fourth proportional to 1,275.66, 1,912.25 and 453.35 is: 679.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.66 : 1,912.25 = 453.35 : x
  2. Step 2: Convert to fraction form
    1,275.66/1,912.25 = 453.35/x
  3. Step 3: Cross multiply
    1,275.66x = 1,912.25 × 453.35
  4. Step 4: Simplify right side
    1,275.66x = 866,924.45
  5. Step 5: Solve for x
    x = 866,924.45/1,275.66
  6. Step 6: Final answer
    x = 679.59

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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.