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Finding the Fourth Proportional to 687.22, 1,030.91 and 225.05

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Solution

The fourth proportional to 687.22, 1,030.91 and 225.05 is: 337.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.22 : 1,030.91 = 225.05 : x
  2. Step 2: Convert to fraction form
    687.22/1,030.91 = 225.05/x
  3. Step 3: Cross multiply
    687.22x = 1,030.91 × 225.05
  4. Step 4: Simplify right side
    687.22x = 232,000.02
  5. Step 5: Solve for x
    x = 232,000.02/687.22
  6. Step 6: Final answer
    x = 337.59

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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.