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Finding the Fourth Proportional to 553.79, 830.12 and 261.45

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Solution

The fourth proportional to 553.79, 830.12 and 261.45 is: 391.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.79 : 830.12 = 261.45 : x
  2. Step 2: Convert to fraction form
    553.79/830.12 = 261.45/x
  3. Step 3: Cross multiply
    553.79x = 830.12 × 261.45
  4. Step 4: Simplify right side
    553.79x = 217,033.57
  5. Step 5: Solve for x
    x = 217,033.57/553.79
  6. Step 6: Final answer
    x = 391.90

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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.