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Finding the Fourth Proportional to 769.74, 1,155.08 and 307.74

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Solution

The fourth proportional to 769.74, 1,155.08 and 307.74 is: 461.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.74 : 1,155.08 = 307.74 : x
  2. Step 2: Convert to fraction form
    769.74/1,155.08 = 307.74/x
  3. Step 3: Cross multiply
    769.74x = 1,155.08 × 307.74
  4. Step 4: Simplify right side
    769.74x = 355,464.32
  5. Step 5: Solve for x
    x = 355,464.32/769.74
  6. Step 6: Final answer
    x = 461.80

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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.