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Finding the Fourth Proportional to 663.28, 989.52 and 609.70

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Solution

The fourth proportional to 663.28, 989.52 and 609.70 is: 909.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.28 : 989.52 = 609.70 : x
  2. Step 2: Convert to fraction form
    663.28/989.52 = 609.70/x
  3. Step 3: Cross multiply
    663.28x = 989.52 × 609.70
  4. Step 4: Simplify right side
    663.28x = 603,310.34
  5. Step 5: Solve for x
    x = 603,310.34/663.28
  6. Step 6: Final answer
    x = 909.59

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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.