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Finding the Fourth Proportional to 556.60, 834.10 and 409.20

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Solution

The fourth proportional to 556.60, 834.10 and 409.20 is: 613.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.60 : 834.10 = 409.20 : x
  2. Step 2: Convert to fraction form
    556.60/834.10 = 409.20/x
  3. Step 3: Cross multiply
    556.60x = 834.10 × 409.20
  4. Step 4: Simplify right side
    556.60x = 341,313.72
  5. Step 5: Solve for x
    x = 341,313.72/556.60
  6. Step 6: Final answer
    x = 613.21

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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.