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Finding the Fourth Proportional to 1,309.62, 1,964.54 and 385.15

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Solution

The fourth proportional to 1,309.62, 1,964.54 and 385.15 is: 577.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.62 : 1,964.54 = 385.15 : x
  2. Step 2: Convert to fraction form
    1,309.62/1,964.54 = 385.15/x
  3. Step 3: Cross multiply
    1,309.62x = 1,964.54 × 385.15
  4. Step 4: Simplify right side
    1,309.62x = 756,642.58
  5. Step 5: Solve for x
    x = 756,642.58/1,309.62
  6. Step 6: Final answer
    x = 577.76

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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.