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Finding the Fourth Proportional to 989.81, 1,484.54 and 259.34

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Solution

The fourth proportional to 989.81, 1,484.54 and 259.34 is: 388.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.81 : 1,484.54 = 259.34 : x
  2. Step 2: Convert to fraction form
    989.81/1,484.54 = 259.34/x
  3. Step 3: Cross multiply
    989.81x = 1,484.54 × 259.34
  4. Step 4: Simplify right side
    989.81x = 384,991.88
  5. Step 5: Solve for x
    x = 384,991.88/989.81
  6. Step 6: Final answer
    x = 388.96

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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.