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Finding the Fourth Proportional to 654.86, 981.68 and 243.72

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Solution

The fourth proportional to 654.86, 981.68 and 243.72 is: 365.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.86 : 981.68 = 243.72 : x
  2. Step 2: Convert to fraction form
    654.86/981.68 = 243.72/x
  3. Step 3: Cross multiply
    654.86x = 981.68 × 243.72
  4. Step 4: Simplify right side
    654.86x = 239,255.52
  5. Step 5: Solve for x
    x = 239,255.52/654.86
  6. Step 6: Final answer
    x = 365.35

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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.