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Finding the Fourth Proportional to 556.45, 834.80 and 209.78

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Solution

The fourth proportional to 556.45, 834.80 and 209.78 is: 314.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.45 : 834.80 = 209.78 : x
  2. Step 2: Convert to fraction form
    556.45/834.80 = 209.78/x
  3. Step 3: Cross multiply
    556.45x = 834.80 × 209.78
  4. Step 4: Simplify right side
    556.45x = 175,124.34
  5. Step 5: Solve for x
    x = 175,124.34/556.45
  6. Step 6: Final answer
    x = 314.72

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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.