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Finding the Fourth Proportional to 1,179.90, 1,770.33 and 521.42

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Solution

The fourth proportional to 1,179.90, 1,770.33 and 521.42 is: 782.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.90 : 1,770.33 = 521.42 : x
  2. Step 2: Convert to fraction form
    1,179.90/1,770.33 = 521.42/x
  3. Step 3: Cross multiply
    1,179.90x = 1,770.33 × 521.42
  4. Step 4: Simplify right side
    1,179.90x = 923,091.46
  5. Step 5: Solve for x
    x = 923,091.46/1,179.90
  6. Step 6: Final answer
    x = 782.35

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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.