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Finding the Fourth Proportional to 989.30, 1,483.89 and 372.92

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Solution

The fourth proportional to 989.30, 1,483.89 and 372.92 is: 559.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.30 : 1,483.89 = 372.92 : x
  2. Step 2: Convert to fraction form
    989.30/1,483.89 = 372.92/x
  3. Step 3: Cross multiply
    989.30x = 1,483.89 × 372.92
  4. Step 4: Simplify right side
    989.30x = 553,371.79
  5. Step 5: Solve for x
    x = 553,371.79/989.30
  6. Step 6: Final answer
    x = 559.36

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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.