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Finding the Fourth Proportional to 989.19, 1,483.79 and 258.83

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Solution

The fourth proportional to 989.19, 1,483.79 and 258.83 is: 388.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.19 : 1,483.79 = 258.83 : x
  2. Step 2: Convert to fraction form
    989.19/1,483.79 = 258.83/x
  3. Step 3: Cross multiply
    989.19x = 1,483.79 × 258.83
  4. Step 4: Simplify right side
    989.19x = 384,046.22
  5. Step 5: Solve for x
    x = 384,046.22/989.19
  6. Step 6: Final answer
    x = 388.24

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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.