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Finding the Fourth Proportional to 776.07, 1,163.30 and 411.30

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Solution

The fourth proportional to 776.07, 1,163.30 and 411.30 is: 616.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.07 : 1,163.30 = 411.30 : x
  2. Step 2: Convert to fraction form
    776.07/1,163.30 = 411.30/x
  3. Step 3: Cross multiply
    776.07x = 1,163.30 × 411.30
  4. Step 4: Simplify right side
    776.07x = 478,463.23
  5. Step 5: Solve for x
    x = 478,463.23/776.07
  6. Step 6: Final answer
    x = 616.52

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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.