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Finding the Fourth Proportional to 990.69, 1,484.96 and 644.27

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Solution

The fourth proportional to 990.69, 1,484.96 and 644.27 is: 965.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.69 : 1,484.96 = 644.27 : x
  2. Step 2: Convert to fraction form
    990.69/1,484.96 = 644.27/x
  3. Step 3: Cross multiply
    990.69x = 1,484.96 × 644.27
  4. Step 4: Simplify right side
    990.69x = 956,714.70
  5. Step 5: Solve for x
    x = 956,714.70/990.69
  6. Step 6: Final answer
    x = 965.71

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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.