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Finding the Fourth Proportional to 1,388, 2,085.36 and 1,313.44

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Solution

The fourth proportional to 1,388, 2,085.36 and 1,313.44 is: 1,973.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388 : 2,085.36 = 1,313.44 : x
  2. Step 2: Convert to fraction form
    1,388/2,085.36 = 1,313.44/x
  3. Step 3: Cross multiply
    1,388x = 2,085.36 × 1,313.44
  4. Step 4: Simplify right side
    1,388x = 2,738,995.24
  5. Step 5: Solve for x
    x = 2,738,995.24/1,388
  6. Step 6: Final answer
    x = 1,973.34

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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.