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Finding the Fourth Proportional to 981.15, 1,353.99 and 539.05

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Solution

The fourth proportional to 981.15, 1,353.99 and 539.05 is: 743.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.15 : 1,353.99 = 539.05 : x
  2. Step 2: Convert to fraction form
    981.15/1,353.99 = 539.05/x
  3. Step 3: Cross multiply
    981.15x = 1,353.99 × 539.05
  4. Step 4: Simplify right side
    981.15x = 729,867.60
  5. Step 5: Solve for x
    x = 729,867.60/981.15
  6. Step 6: Final answer
    x = 743.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.