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Finding the Fourth Proportional to 553.99, 831 and 280.10

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Solution

The fourth proportional to 553.99, 831 and 280.10 is: 420.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.99 : 831 = 280.10 : x
  2. Step 2: Convert to fraction form
    553.99/831 = 280.10/x
  3. Step 3: Cross multiply
    553.99x = 831 × 280.10
  4. Step 4: Simplify right side
    553.99x = 232,763.10
  5. Step 5: Solve for x
    x = 232,763.10/553.99
  6. Step 6: Final answer
    x = 420.16

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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.