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Finding the Fourth Proportional to 774.05, 1,160.85 and 280.38

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Solution

The fourth proportional to 774.05, 1,160.85 and 280.38 is: 420.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.05 : 1,160.85 = 280.38 : x
  2. Step 2: Convert to fraction form
    774.05/1,160.85 = 280.38/x
  3. Step 3: Cross multiply
    774.05x = 1,160.85 × 280.38
  4. Step 4: Simplify right side
    774.05x = 325,479.12
  5. Step 5: Solve for x
    x = 325,479.12/774.05
  6. Step 6: Final answer
    x = 420.49

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1.5x scale

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.