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Finding the Fourth Proportional to 989.46, 1,484.16 and 331.50

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Solution

The fourth proportional to 989.46, 1,484.16 and 331.50 is: 497.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.46 : 1,484.16 = 331.50 : x
  2. Step 2: Convert to fraction form
    989.46/1,484.16 = 331.50/x
  3. Step 3: Cross multiply
    989.46x = 1,484.16 × 331.50
  4. Step 4: Simplify right side
    989.46x = 491,999.04
  5. Step 5: Solve for x
    x = 491,999.04/989.46
  6. Step 6: Final answer
    x = 497.24

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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.