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Finding the Fourth Proportional to 687.24, 1,030.80 and 200.28

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Solution

The fourth proportional to 687.24, 1,030.80 and 200.28 is: 300.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.24 : 1,030.80 = 200.28 : x
  2. Step 2: Convert to fraction form
    687.24/1,030.80 = 200.28/x
  3. Step 3: Cross multiply
    687.24x = 1,030.80 × 200.28
  4. Step 4: Simplify right side
    687.24x = 206,448.62
  5. Step 5: Solve for x
    x = 206,448.62/687.24
  6. Step 6: Final answer
    x = 300.40

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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.