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Finding the Fourth Proportional to 1,248.42, 1,872.78 and 518.49

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Solution

The fourth proportional to 1,248.42, 1,872.78 and 518.49 is: 777.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.42 : 1,872.78 = 518.49 : x
  2. Step 2: Convert to fraction form
    1,248.42/1,872.78 = 518.49/x
  3. Step 3: Cross multiply
    1,248.42x = 1,872.78 × 518.49
  4. Step 4: Simplify right side
    1,248.42x = 971,017.70
  5. Step 5: Solve for x
    x = 971,017.70/1,248.42
  6. Step 6: Final answer
    x = 777.80

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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.