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Finding the Fourth Proportional to 679.56, 1,018.73 and 658.91

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Solution

The fourth proportional to 679.56, 1,018.73 and 658.91 is: 987.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.56 : 1,018.73 = 658.91 : x
  2. Step 2: Convert to fraction form
    679.56/1,018.73 = 658.91/x
  3. Step 3: Cross multiply
    679.56x = 1,018.73 × 658.91
  4. Step 4: Simplify right side
    679.56x = 671,247.94
  5. Step 5: Solve for x
    x = 671,247.94/679.56
  6. Step 6: Final answer
    x = 987.77

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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.