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Finding the Fourth Proportional to 660.65, 985.12 and 628.34

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Solution

The fourth proportional to 660.65, 985.12 and 628.34 is: 936.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.65 : 985.12 = 628.34 : x
  2. Step 2: Convert to fraction form
    660.65/985.12 = 628.34/x
  3. Step 3: Cross multiply
    660.65x = 985.12 × 628.34
  4. Step 4: Simplify right side
    660.65x = 618,983.80
  5. Step 5: Solve for x
    x = 618,983.80/660.65
  6. Step 6: Final answer
    x = 936.94

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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.