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Finding the Fourth Proportional to 770.78, 1,155.67 and 359.91

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Solution

The fourth proportional to 770.78, 1,155.67 and 359.91 is: 539.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.78 : 1,155.67 = 359.91 : x
  2. Step 2: Convert to fraction form
    770.78/1,155.67 = 359.91/x
  3. Step 3: Cross multiply
    770.78x = 1,155.67 × 359.91
  4. Step 4: Simplify right side
    770.78x = 415,936.29
  5. Step 5: Solve for x
    x = 415,936.29/770.78
  6. Step 6: Final answer
    x = 539.63

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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.