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Finding the Fourth Proportional to 553.61, 830.42 and 261.02

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Solution

The fourth proportional to 553.61, 830.42 and 261.02 is: 391.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.61 : 830.42 = 261.02 : x
  2. Step 2: Convert to fraction form
    553.61/830.42 = 261.02/x
  3. Step 3: Cross multiply
    553.61x = 830.42 × 261.02
  4. Step 4: Simplify right side
    553.61x = 216,753.31
  5. Step 5: Solve for x
    x = 216,753.31/553.61
  6. Step 6: Final answer
    x = 391.53

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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.