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Finding the Fourth Proportional to 770.59, 1,155.89 and 664.89

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Solution

The fourth proportional to 770.59, 1,155.89 and 664.89 is: 997.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.59 : 1,155.89 = 664.89 : x
  2. Step 2: Convert to fraction form
    770.59/1,155.89 = 664.89/x
  3. Step 3: Cross multiply
    770.59x = 1,155.89 × 664.89
  4. Step 4: Simplify right side
    770.59x = 768,539.70
  5. Step 5: Solve for x
    x = 768,539.70/770.59
  6. Step 6: Final answer
    x = 997.34

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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.