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Finding the Fourth Proportional to 654.60, 981.75 and 243.75

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Solution

The fourth proportional to 654.60, 981.75 and 243.75 is: 365.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.60 : 981.75 = 243.75 : x
  2. Step 2: Convert to fraction form
    654.60/981.75 = 243.75/x
  3. Step 3: Cross multiply
    654.60x = 981.75 × 243.75
  4. Step 4: Simplify right side
    654.60x = 239,301.56
  5. Step 5: Solve for x
    x = 239,301.56/654.60
  6. Step 6: Final answer
    x = 365.57

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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.