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Finding the Fourth Proportional to 687.31, 1,031 and 276.46

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Solution

The fourth proportional to 687.31, 1,031 and 276.46 is: 414.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.31 : 1,031 = 276.46 : x
  2. Step 2: Convert to fraction form
    687.31/1,031 = 276.46/x
  3. Step 3: Cross multiply
    687.31x = 1,031 × 276.46
  4. Step 4: Simplify right side
    687.31x = 285,030.26
  5. Step 5: Solve for x
    x = 285,030.26/687.31
  6. Step 6: Final answer
    x = 414.70

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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.