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Finding the Fourth Proportional to 687.86, 1,031.70 and 225.66

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Solution

The fourth proportional to 687.86, 1,031.70 and 225.66 is: 338.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.86 : 1,031.70 = 225.66 : x
  2. Step 2: Convert to fraction form
    687.86/1,031.70 = 225.66/x
  3. Step 3: Cross multiply
    687.86x = 1,031.70 × 225.66
  4. Step 4: Simplify right side
    687.86x = 232,812.29
  5. Step 5: Solve for x
    x = 232,812.29/687.86
  6. Step 6: Final answer
    x = 338.46

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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.