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Finding the Fourth Proportional to 1,119.72, 1,546.38 and 770.88

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Solution

The fourth proportional to 1,119.72, 1,546.38 and 770.88 is: 1,064.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.72 : 1,546.38 = 770.88 : x
  2. Step 2: Convert to fraction form
    1,119.72/1,546.38 = 770.88/x
  3. Step 3: Cross multiply
    1,119.72x = 1,546.38 × 770.88
  4. Step 4: Simplify right side
    1,119.72x = 1,192,073.41
  5. Step 5: Solve for x
    x = 1,192,073.41/1,119.72
  6. Step 6: Final answer
    x = 1,064.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.