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Finding the Fourth Proportional to 553.55, 830.12 and 206.80

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Solution

The fourth proportional to 553.55, 830.12 and 206.80 is: 310.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.55 : 830.12 = 206.80 : x
  2. Step 2: Convert to fraction form
    553.55/830.12 = 206.80/x
  3. Step 3: Cross multiply
    553.55x = 830.12 × 206.80
  4. Step 4: Simplify right side
    553.55x = 171,668.82
  5. Step 5: Solve for x
    x = 171,668.82/553.55
  6. Step 6: Final answer
    x = 310.12

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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.