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Finding the Fourth Proportional to 660.67, 984.54 and 621.72

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Solution

The fourth proportional to 660.67, 984.54 and 621.72 is: 926.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.67 : 984.54 = 621.72 : x
  2. Step 2: Convert to fraction form
    660.67/984.54 = 621.72/x
  3. Step 3: Cross multiply
    660.67x = 984.54 × 621.72
  4. Step 4: Simplify right side
    660.67x = 612,105.10
  5. Step 5: Solve for x
    x = 612,105.10/660.67
  6. Step 6: Final answer
    x = 926.50

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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.