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Finding the Fourth Proportional to 1,275.55, 1,912.14 and 453.67

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Solution

The fourth proportional to 1,275.55, 1,912.14 and 453.67 is: 680.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.55 : 1,912.14 = 453.67 : x
  2. Step 2: Convert to fraction form
    1,275.55/1,912.14 = 453.67/x
  3. Step 3: Cross multiply
    1,275.55x = 1,912.14 × 453.67
  4. Step 4: Simplify right side
    1,275.55x = 867,475.77
  5. Step 5: Solve for x
    x = 867,475.77/1,275.55
  6. Step 6: Final answer
    x = 680.08

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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.