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Finding the Fourth Proportional to 776.69, 1,165.02 and 289.74

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Solution

The fourth proportional to 776.69, 1,165.02 and 289.74 is: 434.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.69 : 1,165.02 = 289.74 : x
  2. Step 2: Convert to fraction form
    776.69/1,165.02 = 289.74/x
  3. Step 3: Cross multiply
    776.69x = 1,165.02 × 289.74
  4. Step 4: Simplify right side
    776.69x = 337,552.89
  5. Step 5: Solve for x
    x = 337,552.89/776.69
  6. Step 6: Final answer
    x = 434.61

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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.