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Finding the Fourth Proportional to 654.78, 981.47 and 491.96

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Solution

The fourth proportional to 654.78, 981.47 and 491.96 is: 737.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.78 : 981.47 = 491.96 : x
  2. Step 2: Convert to fraction form
    654.78/981.47 = 491.96/x
  3. Step 3: Cross multiply
    654.78x = 981.47 × 491.96
  4. Step 4: Simplify right side
    654.78x = 482,843.98
  5. Step 5: Solve for x
    x = 482,843.98/654.78
  6. Step 6: Final answer
    x = 737.41

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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.