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Finding the Fourth Proportional to 374.78, 561.80 and 131.11

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Solution

The fourth proportional to 374.78, 561.80 and 131.11 is: 196.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.78 : 561.80 = 131.11 : x
  2. Step 2: Convert to fraction form
    374.78/561.80 = 131.11/x
  3. Step 3: Cross multiply
    374.78x = 561.80 × 131.11
  4. Step 4: Simplify right side
    374.78x = 73,656.52
  5. Step 5: Solve for x
    x = 73,656.52/374.78
  6. Step 6: Final answer
    x = 196.53

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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.