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Finding the Fourth Proportional to 374.17, 561.05 and 209.81

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Solution

The fourth proportional to 374.17, 561.05 and 209.81 is: 314.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.17 : 561.05 = 209.81 : x
  2. Step 2: Convert to fraction form
    374.17/561.05 = 209.81/x
  3. Step 3: Cross multiply
    374.17x = 561.05 × 209.81
  4. Step 4: Simplify right side
    374.17x = 117,713.90
  5. Step 5: Solve for x
    x = 117,713.90/374.17
  6. Step 6: Final answer
    x = 314.60

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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.