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Finding the Fourth Proportional to 1,309.44, 1,963.92 and 947.28

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Solution

The fourth proportional to 1,309.44, 1,963.92 and 947.28 is: 1,420.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.44 : 1,963.92 = 947.28 : x
  2. Step 2: Convert to fraction form
    1,309.44/1,963.92 = 947.28/x
  3. Step 3: Cross multiply
    1,309.44x = 1,963.92 × 947.28
  4. Step 4: Simplify right side
    1,309.44x = 1,860,382.14
  5. Step 5: Solve for x
    x = 1,860,382.14/1,309.44
  6. Step 6: Final answer
    x = 1,420.75

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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.