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Finding the Fourth Proportional to 1,309.93, 1,965.17 and 385.49

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Solution

The fourth proportional to 1,309.93, 1,965.17 and 385.49 is: 578.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.93 : 1,965.17 = 385.49 : x
  2. Step 2: Convert to fraction form
    1,309.93/1,965.17 = 385.49/x
  3. Step 3: Cross multiply
    1,309.93x = 1,965.17 × 385.49
  4. Step 4: Simplify right side
    1,309.93x = 757,559.26
  5. Step 5: Solve for x
    x = 757,559.26/1,309.93
  6. Step 6: Final answer
    x = 578.32

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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.