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Finding the Fourth Proportional to 687.26, 1,030.87 and 254.50

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Solution

The fourth proportional to 687.26, 1,030.87 and 254.50 is: 381.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.26 : 1,030.87 = 254.50 : x
  2. Step 2: Convert to fraction form
    687.26/1,030.87 = 254.50/x
  3. Step 3: Cross multiply
    687.26x = 1,030.87 × 254.50
  4. Step 4: Simplify right side
    687.26x = 262,356.42
  5. Step 5: Solve for x
    x = 262,356.42/687.26
  6. Step 6: Final answer
    x = 381.74

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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.