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Finding the Fourth Proportional to 1,309.38, 1,964.03 and 384.90

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Solution

The fourth proportional to 1,309.38, 1,964.03 and 384.90 is: 577.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.38 : 1,964.03 = 384.90 : x
  2. Step 2: Convert to fraction form
    1,309.38/1,964.03 = 384.90/x
  3. Step 3: Cross multiply
    1,309.38x = 1,964.03 × 384.90
  4. Step 4: Simplify right side
    1,309.38x = 755,953.22
  5. Step 5: Solve for x
    x = 755,953.22/1,309.38
  6. Step 6: Final answer
    x = 577.34

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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.