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Finding the Fourth Proportional to 400.99, 553.55 and 283.06

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Solution

The fourth proportional to 400.99, 553.55 and 283.06 is: 390.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.99 : 553.55 = 283.06 : x
  2. Step 2: Convert to fraction form
    400.99/553.55 = 283.06/x
  3. Step 3: Cross multiply
    400.99x = 553.55 × 283.06
  4. Step 4: Simplify right side
    400.99x = 156,687.86
  5. Step 5: Solve for x
    x = 156,687.86/400.99
  6. Step 6: Final answer
    x = 390.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.