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Finding the Fourth Proportional to 553.95, 830.47 and 261.30

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Solution

The fourth proportional to 553.95, 830.47 and 261.30 is: 391.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.95 : 830.47 = 261.30 : x
  2. Step 2: Convert to fraction form
    553.95/830.47 = 261.30/x
  3. Step 3: Cross multiply
    553.95x = 830.47 × 261.30
  4. Step 4: Simplify right side
    553.95x = 216,997.82
  5. Step 5: Solve for x
    x = 216,997.82/553.95
  6. Step 6: Final answer
    x = 391.73

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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.