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Finding the Fourth Proportional to 776.57, 1,165.08 and 289.63

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Solution

The fourth proportional to 776.57, 1,165.08 and 289.63 is: 434.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.57 : 1,165.08 = 289.63 : x
  2. Step 2: Convert to fraction form
    776.57/1,165.08 = 289.63/x
  3. Step 3: Cross multiply
    776.57x = 1,165.08 × 289.63
  4. Step 4: Simplify right side
    776.57x = 337,436.30
  5. Step 5: Solve for x
    x = 337,436.30/776.57
  6. Step 6: Final answer
    x = 434.52

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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.