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Finding the Fourth Proportional to 654.45, 981.95 and 394.94

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Solution

The fourth proportional to 654.45, 981.95 and 394.94 is: 592.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.45 : 981.95 = 394.94 : x
  2. Step 2: Convert to fraction form
    654.45/981.95 = 394.94/x
  3. Step 3: Cross multiply
    654.45x = 981.95 × 394.94
  4. Step 4: Simplify right side
    654.45x = 387,804.45
  5. Step 5: Solve for x
    x = 387,804.45/654.45
  6. Step 6: Final answer
    x = 592.57

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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.