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Finding the Fourth Proportional to 687.91, 1,031.91 and 277.04

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Solution

The fourth proportional to 687.91, 1,031.91 and 277.04 is: 415.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.91 : 1,031.91 = 277.04 : x
  2. Step 2: Convert to fraction form
    687.91/1,031.91 = 277.04/x
  3. Step 3: Cross multiply
    687.91x = 1,031.91 × 277.04
  4. Step 4: Simplify right side
    687.91x = 285,881.89
  5. Step 5: Solve for x
    x = 285,881.89/687.91
  6. Step 6: Final answer
    x = 415.58

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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.