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Finding the Fourth Proportional to 1,243.20, 1,865.28 and 695.36

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Solution

The fourth proportional to 1,243.20, 1,865.28 and 695.36 is: 1,043.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.20 : 1,865.28 = 695.36 : x
  2. Step 2: Convert to fraction form
    1,243.20/1,865.28 = 695.36/x
  3. Step 3: Cross multiply
    1,243.20x = 1,865.28 × 695.36
  4. Step 4: Simplify right side
    1,243.20x = 1,297,041.10
  5. Step 5: Solve for x
    x = 1,297,041.10/1,243.20
  6. Step 6: Final answer
    x = 1,043.31

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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.