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Finding the Fourth Proportional to 679.99, 1,024.97 and 621.56

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Solution

The fourth proportional to 679.99, 1,024.97 and 621.56 is: 936.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.99 : 1,024.97 = 621.56 : x
  2. Step 2: Convert to fraction form
    679.99/1,024.97 = 621.56/x
  3. Step 3: Cross multiply
    679.99x = 1,024.97 × 621.56
  4. Step 4: Simplify right side
    679.99x = 637,078.95
  5. Step 5: Solve for x
    x = 637,078.95/679.99
  6. Step 6: Final answer
    x = 936.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.