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Finding the Fourth Proportional to 374.70, 561.90 and 131.10

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Solution

The fourth proportional to 374.70, 561.90 and 131.10 is: 196.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.70 : 561.90 = 131.10 : x
  2. Step 2: Convert to fraction form
    374.70/561.90 = 131.10/x
  3. Step 3: Cross multiply
    374.70x = 561.90 × 131.10
  4. Step 4: Simplify right side
    374.70x = 73,665.09
  5. Step 5: Solve for x
    x = 73,665.09/374.70
  6. Step 6: Final answer
    x = 196.60

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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.