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Finding the Fourth Proportional to 724.99, 1,087.49 and 204.99

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Solution

The fourth proportional to 724.99, 1,087.49 and 204.99 is: 307.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.99 : 1,087.49 = 204.99 : x
  2. Step 2: Convert to fraction form
    724.99/1,087.49 = 204.99/x
  3. Step 3: Cross multiply
    724.99x = 1,087.49 × 204.99
  4. Step 4: Simplify right side
    724.99x = 222,924.58
  5. Step 5: Solve for x
    x = 222,924.58/724.99
  6. Step 6: Final answer
    x = 307.49

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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.