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Finding the Fourth Proportional to 989.01, 1,483.65 and 411.75

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Solution

The fourth proportional to 989.01, 1,483.65 and 411.75 is: 617.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.01 : 1,483.65 = 411.75 : x
  2. Step 2: Convert to fraction form
    989.01/1,483.65 = 411.75/x
  3. Step 3: Cross multiply
    989.01x = 1,483.65 × 411.75
  4. Step 4: Simplify right side
    989.01x = 610,892.89
  5. Step 5: Solve for x
    x = 610,892.89/989.01
  6. Step 6: Final answer
    x = 617.68

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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.