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Finding the Fourth Proportional to 770.55, 1,155.95 and 308.34

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Solution

The fourth proportional to 770.55, 1,155.95 and 308.34 is: 462.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.55 : 1,155.95 = 308.34 : x
  2. Step 2: Convert to fraction form
    770.55/1,155.95 = 308.34/x
  3. Step 3: Cross multiply
    770.55x = 1,155.95 × 308.34
  4. Step 4: Simplify right side
    770.55x = 356,424.08
  5. Step 5: Solve for x
    x = 356,424.08/770.55
  6. Step 6: Final answer
    x = 462.56

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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.