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Finding the Fourth Proportional to 374.20, 561.54 and 266.20

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Solution

The fourth proportional to 374.20, 561.54 and 266.20 is: 399.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.20 : 561.54 = 266.20 : x
  2. Step 2: Convert to fraction form
    374.20/561.54 = 266.20/x
  3. Step 3: Cross multiply
    374.20x = 561.54 × 266.20
  4. Step 4: Simplify right side
    374.20x = 149,481.95
  5. Step 5: Solve for x
    x = 149,481.95/374.20
  6. Step 6: Final answer
    x = 399.47

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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.