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Finding the Fourth Proportional to 1,248.21, 1,872.51 and 426.47

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Solution

The fourth proportional to 1,248.21, 1,872.51 and 426.47 is: 639.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.21 : 1,872.51 = 426.47 : x
  2. Step 2: Convert to fraction form
    1,248.21/1,872.51 = 426.47/x
  3. Step 3: Cross multiply
    1,248.21x = 1,872.51 × 426.47
  4. Step 4: Simplify right side
    1,248.21x = 798,559.98
  5. Step 5: Solve for x
    x = 798,559.98/1,248.21
  6. Step 6: Final answer
    x = 639.76

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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.