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Finding the Fourth Proportional to 1,309.52, 1,964 and 385.20

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Solution

The fourth proportional to 1,309.52, 1,964 and 385.20 is: 577.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.52 : 1,964 = 385.20 : x
  2. Step 2: Convert to fraction form
    1,309.52/1,964 = 385.20/x
  3. Step 3: Cross multiply
    1,309.52x = 1,964 × 385.20
  4. Step 4: Simplify right side
    1,309.52x = 756,532.80
  5. Step 5: Solve for x
    x = 756,532.80/1,309.52
  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.