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Finding the Fourth Proportional to 1,173.40, 1,760 and 479.88

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Solution

The fourth proportional to 1,173.40, 1,760 and 479.88 is: 719.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.40 : 1,760 = 479.88 : x
  2. Step 2: Convert to fraction form
    1,173.40/1,760 = 479.88/x
  3. Step 3: Cross multiply
    1,173.40x = 1,760 × 479.88
  4. Step 4: Simplify right side
    1,173.40x = 844,588.80
  5. Step 5: Solve for x
    x = 844,588.80/1,173.40
  6. Step 6: Final answer
    x = 719.78

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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.