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Finding the Fourth Proportional to 776.99, 1,165.34 and 386.57

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Solution

The fourth proportional to 776.99, 1,165.34 and 386.57 is: 579.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.99 : 1,165.34 = 386.57 : x
  2. Step 2: Convert to fraction form
    776.99/1,165.34 = 386.57/x
  3. Step 3: Cross multiply
    776.99x = 1,165.34 × 386.57
  4. Step 4: Simplify right side
    776.99x = 450,487.19
  5. Step 5: Solve for x
    x = 450,487.19/776.99
  6. Step 6: Final answer
    x = 579.78

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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.