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Finding the Fourth Proportional to 770.10, 1,153.80 and 481.20

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Solution

The fourth proportional to 770.10, 1,153.80 and 481.20 is: 720.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.10 : 1,153.80 = 481.20 : x
  2. Step 2: Convert to fraction form
    770.10/1,153.80 = 481.20/x
  3. Step 3: Cross multiply
    770.10x = 1,153.80 × 481.20
  4. Step 4: Simplify right side
    770.10x = 555,208.56
  5. Step 5: Solve for x
    x = 555,208.56/770.10
  6. Step 6: Final answer
    x = 720.96

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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.