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Finding the Fourth Proportional to 989.68, 1,484.42 and 259.17

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Solution

The fourth proportional to 989.68, 1,484.42 and 259.17 is: 388.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.68 : 1,484.42 = 259.17 : x
  2. Step 2: Convert to fraction form
    989.68/1,484.42 = 259.17/x
  3. Step 3: Cross multiply
    989.68x = 1,484.42 × 259.17
  4. Step 4: Simplify right side
    989.68x = 384,717.13
  5. Step 5: Solve for x
    x = 384,717.13/989.68
  6. Step 6: Final answer
    x = 388.73

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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.