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Finding the Fourth Proportional to 374.14, 561.21 and 139.93

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Solution

The fourth proportional to 374.14, 561.21 and 139.93 is: 209.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.14 : 561.21 = 139.93 : x
  2. Step 2: Convert to fraction form
    374.14/561.21 = 139.93/x
  3. Step 3: Cross multiply
    374.14x = 561.21 × 139.93
  4. Step 4: Simplify right side
    374.14x = 78,529.98
  5. Step 5: Solve for x
    x = 78,529.98/374.14
  6. Step 6: Final answer
    x = 209.89

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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.