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Finding the Fourth Proportional to 390.97, 586.43 and 131.10

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Solution

The fourth proportional to 390.97, 586.43 and 131.10 is: 196.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.97 : 586.43 = 131.10 : x
  2. Step 2: Convert to fraction form
    390.97/586.43 = 131.10/x
  3. Step 3: Cross multiply
    390.97x = 586.43 × 131.10
  4. Step 4: Simplify right side
    390.97x = 76,880.97
  5. Step 5: Solve for x
    x = 76,880.97/390.97
  6. Step 6: Final answer
    x = 196.64

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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.