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Finding the Fourth Proportional to 654.46, 981.70 and 399.58

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Solution

The fourth proportional to 654.46, 981.70 and 399.58 is: 599.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.46 : 981.70 = 399.58 : x
  2. Step 2: Convert to fraction form
    654.46/981.70 = 399.58/x
  3. Step 3: Cross multiply
    654.46x = 981.70 × 399.58
  4. Step 4: Simplify right side
    654.46x = 392,267.69
  5. Step 5: Solve for x
    x = 392,267.69/654.46
  6. Step 6: Final answer
    x = 599.38

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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.