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Finding the Fourth Proportional to 1,309.82, 1,964.54 and 385.19

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Solution

The fourth proportional to 1,309.82, 1,964.54 and 385.19 is: 577.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.82 : 1,964.54 = 385.19 : x
  2. Step 2: Convert to fraction form
    1,309.82/1,964.54 = 385.19/x
  3. Step 3: Cross multiply
    1,309.82x = 1,964.54 × 385.19
  4. Step 4: Simplify right side
    1,309.82x = 756,712.30
  5. Step 5: Solve for x
    x = 756,712.30/1,309.82
  6. Step 6: Final answer
    x = 577.72

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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.