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Finding the Fourth Proportional to 553.66, 830.31 and 261.12

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Solution

The fourth proportional to 553.66, 830.31 and 261.12 is: 391.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.66 : 830.31 = 261.12 : x
  2. Step 2: Convert to fraction form
    553.66/830.31 = 261.12/x
  3. Step 3: Cross multiply
    553.66x = 830.31 × 261.12
  4. Step 4: Simplify right side
    553.66x = 216,810.55
  5. Step 5: Solve for x
    x = 216,810.55/553.66
  6. Step 6: Final answer
    x = 391.60

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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.