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Finding the Fourth Proportional to 770.18, 1,153.85 and 405.20

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Solution

The fourth proportional to 770.18, 1,153.85 and 405.20 is: 607.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.18 : 1,153.85 = 405.20 : x
  2. Step 2: Convert to fraction form
    770.18/1,153.85 = 405.20/x
  3. Step 3: Cross multiply
    770.18x = 1,153.85 × 405.20
  4. Step 4: Simplify right side
    770.18x = 467,540.88
  5. Step 5: Solve for x
    x = 467,540.88/770.18
  6. Step 6: Final answer
    x = 607.06

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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.