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Finding the Fourth Proportional to 770.73, 1,155.63 and 308.72

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Solution

The fourth proportional to 770.73, 1,155.63 and 308.72 is: 462.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.73 : 1,155.63 = 308.72 : x
  2. Step 2: Convert to fraction form
    770.73/1,155.63 = 308.72/x
  3. Step 3: Cross multiply
    770.73x = 1,155.63 × 308.72
  4. Step 4: Simplify right side
    770.73x = 356,766.09
  5. Step 5: Solve for x
    x = 356,766.09/770.73
  6. Step 6: Final answer
    x = 462.89

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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.