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Finding the Fourth Proportional to 374.21, 561.55 and 143.12

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Solution

The fourth proportional to 374.21, 561.55 and 143.12 is: 214.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.21 : 561.55 = 143.12 : x
  2. Step 2: Convert to fraction form
    374.21/561.55 = 143.12/x
  3. Step 3: Cross multiply
    374.21x = 561.55 × 143.12
  4. Step 4: Simplify right side
    374.21x = 80,365.87
  5. Step 5: Solve for x
    x = 80,365.87/374.21
  6. Step 6: Final answer
    x = 214.76

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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.