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Finding the Fourth Proportional to 687.23, 1,027.22 and 670.82

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Solution

The fourth proportional to 687.23, 1,027.22 and 670.82 is: 1,002.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.23 : 1,027.22 = 670.82 : x
  2. Step 2: Convert to fraction form
    687.23/1,027.22 = 670.82/x
  3. Step 3: Cross multiply
    687.23x = 1,027.22 × 670.82
  4. Step 4: Simplify right side
    687.23x = 689,079.72
  5. Step 5: Solve for x
    x = 689,079.72/687.23
  6. Step 6: Final answer
    x = 1,002.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.