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Finding the Fourth Proportional to 687.12, 1,030.50 and 200.22

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Solution

The fourth proportional to 687.12, 1,030.50 and 200.22 is: 300.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.12 : 1,030.50 = 200.22 : x
  2. Step 2: Convert to fraction form
    687.12/1,030.50 = 200.22/x
  3. Step 3: Cross multiply
    687.12x = 1,030.50 × 200.22
  4. Step 4: Simplify right side
    687.12x = 206,326.71
  5. Step 5: Solve for x
    x = 206,326.71/687.12
  6. Step 6: Final answer
    x = 300.28

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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.