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Finding the Fourth Proportional to 687.14, 1,029.24 and 427.22

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Solution

The fourth proportional to 687.14, 1,029.24 and 427.22 is: 639.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.14 : 1,029.24 = 427.22 : x
  2. Step 2: Convert to fraction form
    687.14/1,029.24 = 427.22/x
  3. Step 3: Cross multiply
    687.14x = 1,029.24 × 427.22
  4. Step 4: Simplify right side
    687.14x = 439,711.91
  5. Step 5: Solve for x
    x = 439,711.91/687.14
  6. Step 6: Final answer
    x = 639.92

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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.