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Finding the Fourth Proportional to 687.42, 1,031.46 and 340.79

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Solution

The fourth proportional to 687.42, 1,031.46 and 340.79 is: 511.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.42 : 1,031.46 = 340.79 : x
  2. Step 2: Convert to fraction form
    687.42/1,031.46 = 340.79/x
  3. Step 3: Cross multiply
    687.42x = 1,031.46 × 340.79
  4. Step 4: Simplify right side
    687.42x = 351,506.10
  5. Step 5: Solve for x
    x = 351,506.10/687.42
  6. Step 6: Final answer
    x = 511.34

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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.