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Finding the Fourth Proportional to 1,208.34, 1,812.40 and 724.48

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Solution

The fourth proportional to 1,208.34, 1,812.40 and 724.48 is: 1,086.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.34 : 1,812.40 = 724.48 : x
  2. Step 2: Convert to fraction form
    1,208.34/1,812.40 = 724.48/x
  3. Step 3: Cross multiply
    1,208.34x = 1,812.40 × 724.48
  4. Step 4: Simplify right side
    1,208.34x = 1,313,041.21
  5. Step 5: Solve for x
    x = 1,313,041.21/1,208.34
  6. Step 6: Final answer
    x = 1,086.65

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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.