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Finding the Fourth Proportional to 374.78, 561.70 and 220.81

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Solution

The fourth proportional to 374.78, 561.70 and 220.81 is: 330.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.78 : 561.70 = 220.81 : x
  2. Step 2: Convert to fraction form
    374.78/561.70 = 220.81/x
  3. Step 3: Cross multiply
    374.78x = 561.70 × 220.81
  4. Step 4: Simplify right side
    374.78x = 124,027.87
  5. Step 5: Solve for x
    x = 124,027.87/374.78
  6. Step 6: Final answer
    x = 330.94

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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.